Common Weakness Enumeration
CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
1661 vulnerabilities reference this CWE, most recent first.
CVE-2026-76787 (GCVE-0-2026-76787)
Vulnerability from cvelistv5 – Published: 2026-10-19 20:39 – Updated: 2026-11-04 05:01
VLAI
EPSS
VEX
Title
NULL pointer dereference in the UpdateHub FOTA client when probe metadata omits sha256sum
Summary
The UpdateHub firmware-over-the-air client parses the CoAP probe response with Zephyr's JSON library in z_impl_updatehub_probe() (subsys/mgmt/updatehub/updatehub.c). The decoder treats every descriptor field as optional — json_obj_parse() returns a bitmask of the fields it actually decoded and never fails on a missing one — so a response that omits the "sha256sum" string leaves the corresponding const char * in the zero-initialised struct resp_probe_any_boards / struct resp_probe_some_boards at NULL. Both metadata branches then computed sha256size = strlen(...objects.sha256sum) + 1 before any validation, dereferencing that NULL pointer; the SHA256_HEX_DIGEST_SIZE test that follows operates on a value the bad read has already produced and cannot prevent it.
The metadata is supplied entirely by the network peer: probe_cb() accepts the datagram, runs coap_packet_parse() and copies the payload with no token matching and no cryptographic check. With CONFIG_UPDATEHUB_DTLS unset — the default — start_coap_client() uses plain CoAP over UDP on port 5683 with no peer authentication and resolves the server via unauthenticated DNS, so an on-path attacker, a DNS spoofer, or an off-path attacker who wins the race with a forged source address can deliver the malformed metadata. A probe response as simple as "objects":[[{}],[{}]] suffices, and no user interaction is required because updatehub_autohandler() polls on CONFIG_UPDATEHUB_POLL_INTERVAL. When CONFIG_UPDATEHUB_DTLS=y the trigger narrows to a malicious or compromised update server.
The primitive is a read at address zero, not a write, so the impact is availability only. On targets where the low address range is unmapped or protected — MMU-based architectures, builds with CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT/_MPU/_PMP, TrustZone non-secure images, and SoCs such as nRF54L whose 0x0–0x400 window is unmapped — the load faults and Zephyr's default fatal handler halts the system, giving a remotely re-triggerable denial of service on every poll. On classic Cortex-M targets where the vector table is readable at address zero the walk usually terminates immediately and the request is rejected by the length check, so the outcome is configuration- and SoC-dependent. There is no memory write, and the copied bytes are only compared against the locally computed image hash, so there is no information-disclosure channel.
The fix adds an explicit sha256sum == NULL test that returns UPDATEHUB_METADATA_ERROR ahead of the strlen() in both metadata branches. Debug builds (CONFIG_UPDATEHUB_LOG_LEVEL=4) still format the same pointers with %s in a LOG_DBG() loop that runs before the new checks, so that variant remains in debug configurations only.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-20 18:04 UTC
CWE
- CWE-476 - memory-safety
Assigner
zephyr
CNA
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zephyrproject | zephyr |
Affected:
2.4.0 , < 4.3.2
(semver)
Affected: 4.4.0 , < 4.5.0 (semver) |
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CVE-2026-76781 (GCVE-0-2026-76781)
Vulnerability from cvelistv5 – Published: 2026-09-17 15:11 – Updated: 2026-11-06 00:44
VLAI
EPSS
VEX
Title
Libxml2: libxml2: null pointer dereference parsing nextcatalog without catalog attribute
Summary
A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 17:10 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
redhat
CNA
References
5 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:57604 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-76781 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2519776 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/libxml2/-/commit/c… | |
| https://gitlab.gnome.org/GNOME/libxml2/-/merge_re… |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
Unaffected:
2.15.3-0.1.3.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/a:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:rhel_els:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/a:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/a:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 5 |
cpe:/a:redhat:openshift:5
|
Date Public
2026-08-19 00:00
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CVE-2026-76650 (GCVE-0-2026-76650)
Vulnerability from cvelistv5 – Published: 2026-08-28 20:19 – Updated: 2026-08-31 18:37
VLAI
EPSS
VEX
Title
Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing in TP-Link TL-WR841N
Summary
A NULL
pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing
SOAP state variable query requests. A specially crafted SOAP query may trigger
unexpected termination or instability of the process hosting the UPnP service.
Successful
exploitation may result in a denial-of-service condition affecting UPnP
discovery, state query, or related management functionality until the affected
process is restarted or the device is rebooted.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:36 UTC
CWE
- CWE-476 - NULL pointer dereference
Assigner
TPLink
CNA
References
3 references
| URL | Tags |
|---|---|
| https://www.tp-link.com/us/support/download/tl-wr… | patch |
| https://www.tp-link.com/en/support/download/tl-wr… | patch |
| https://www.tp-link.com/us/support/faq/5270/ | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TP-Link System Inc. | TL-WR841N v14 |
Affected:
0 , < TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478
(custom)
Affected: 0 , < TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 (custom) |
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CVE-2026-76649 (GCVE-0-2026-76649)
Vulnerability from cvelistv5 – Published: 2026-08-28 20:18 – Updated: 2026-08-31 18:37
VLAI
EPSS
VEX
Title
Pre-Authentication NULL Pointer Dereference in UPnP SOAP Action Request Processing in TP-Link TL-WR841N
Summary
A NULL
pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing SOAP action requests. A specially crafted SOAP action request containing unexpected XML content may cause the UPnP daemon to terminate unexpectedly.
Successful exploitation may result in a denial-of-service condition affecting UPnP functionality until the service is restarted or the device is rebooted.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:37 UTC
CWE
- CWE-476 - NULL pointer dereference
Assigner
TPLink
CNA
References
3 references
| URL | Tags |
|---|---|
| https://www.tp-link.com/us/support/download/tl-wr… | patch |
| https://www.tp-link.com/en/support/download/tl-wr… | patch |
| https://www.tp-link.com/us/support/faq/5270/ | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TP-Link System Inc. | TL-WR841N v14 |
Affected:
0 , < TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478
(custom)
Affected: 0 , < TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 (custom) |
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CVE-2026-76492 (GCVE-0-2026-76492)
Vulnerability from cvelistv5 – Published: 2026-10-21 16:17 – Updated: 2026-11-07 17:29
VLAI
EPSS
VEX
CVE Program bundle warning
The CVE Program recognizes that this CVE Record provides vulnerability information that a Supplier CNA believes is very important to consumers. The CVE Program has flagged this CVE Record as it assigns a single CVE ID to a collection of individual vulnerabilities which does not align with CVE's "one vulnerability, one ID" principle, and therefore provides incomplete information. For further clarification, please see the CVE Program's blog, "Preserving Vulnerability-Level Identification" linked below. Details within the CNA container below are viewable by clicking on the CNA name.
https://www.cve.org/Media/News/item/blog/2026/06/…Title
Cisco Expressway Series Software Hardening Release: October 2026 - NULL Pointer Vulnerabilities
Summary
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-76492 are related to issues concerning null pointers that are grouped under the Common Weakness Enumeration (CWE) Base CWE-476.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 13:21 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
cisco
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway |
Affected:
X8.11.2
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CVE-2026-76192 (GCVE-0-2026-76192)
Vulnerability from cvelistv5 – Published: 2026-09-22 18:33 – Updated: 2026-09-22 19:07
VLAI
EPSS
VEX
Title
InDesign Desktop | NULL Pointer Dereference (CWE-476)
Summary
InDesign Desktop is affected by a NULL Pointer Dereference vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 19:07 UTC
CWE
- CWE-476 - NULL Pointer Dereference (CWE-476)
Assigner
adobe
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/indesig… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | InDesign Desktop |
Affected:
0 , ≤ 21.5
(semver)
Unaffected: 21.6 (semver) |
|
| Adobe | InDesign Desktop |
Affected:
0 , ≤ 20.5.4
(semver)
Unaffected: 20.5.5 (semver) |
Date Public
2026-09-22 17:00
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CVE-2026-76166 (GCVE-0-2026-76166)
Vulnerability from cvelistv5 – Published: 2026-08-19 10:01 – Updated: 2026-11-09 23:15
VLAI
EPSS
VEX
Title
Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
Summary
A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:19 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
redhat
CNA
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:93618 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:93622 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:96228 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:96229 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-76166 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2510883 | issue-trackingx_refsource_REDHAT |
Impacted products
25 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat JBoss Web Server 6.2.6 |
cpe:/a:redhat:jboss_enterprise_web_server:6.2
|
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:1.3.6-2.redhat_2.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:1.3.6-2.redhat_2.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:1.3.6-2.redhat_2.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0.3 |
cpe:/a:redhat:jboss_enterprise_web_server:7.0
|
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:1.3.7-4.redhat_4.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:1.3.7-4.redhat_4.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:1.3.7-4.redhat_4.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
cpe:/a:redhat:jboss_enterprise_application_platform:8
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack |
cpe:/a:redhat:jbosseapxp
|
|
| Red Hat | Red Hat JBoss Web Server 5 |
cpe:/a:redhat:jboss_enterprise_web_server:5
|
|
| Red Hat | Red Hat Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
Date Public
2026-08-04 00:00
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CVE-2026-76014 (GCVE-0-2026-76014)
Vulnerability from cvelistv5 – Published: 2026-08-19 02:45 – Updated: 2026-08-25 01:49 X_Open Source
VLAI
EPSS
VEX
Title
BusyBox FEATURE_WGET_TIMEOUT wget.c null pointer dereference
Summary
A vulnerability has been found in BusyBox up to 1.30.1. This vulnerability affects unknown code of the file networking/wget.c of the component FEATURE_WGET_TIMEOUT Handler. Such manipulation of the argument -T leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The name of the patch is 83a40bf7a93c8ac093d33ab452222dd5b9eb57ff. A patch should be applied to remediate this issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 01:49 UTC
Assigner
VulDB
CNA
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/391923 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/391923/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-76014 | third-party-advisory |
| https://vuldb.com/submit/878212 | third-party-advisory |
| https://github.com/mirror/busybox/issues/124 | issue-tracking |
| https://gist.github.com/wyxstarry/5c199ec824928c5… | exploit |
| https://github.com/mirror/busybox/commit/83a40bf7… | patch |
Impacted products
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CVE-2026-75805 (GCVE-0-2026-75805)
Vulnerability from cvelistv5 – Published: 2026-09-29 15:32 – Updated: 2026-09-29 16:54
VLAI
EPSS
VEX
Title
NULL Pointer Dereference in CMP Client Revocation Response Handling
Summary
Issue summary: A CMP client that requests certificate revocation on the basis
of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when
processing a crafted revocation response.
Impact summary: The NULL pointer dereference happens on a read which
leads to a crash and a Denial of Service for the affected client application.
CWE: CWE-476: NULL-pointer dereference
Description: A CMP client revoking a certificate has to tell the server which
certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the
certificate itself or its issuer name and serial number. This is
'openssl cmp -cmd rr -csr <file>' on the command line, or
OSSL_CMP_exec_RR_ses() with the certificate supplied via
OSSL_CMP_CTX_set1_p10CSR() through the API.
A CSR does not contain the issuer name and serial number of the certificate,
so the client does not send them. A server may optionally name the
certificate it revoked in its response, and the client then compares that
name against what it sent. Having sent neither an issuer name nor a serial
number, it has nothing to compare against, and a server returning a specially
crafted name causes the client to read from a NULL pointer and crash.
The revocation response is checked for valid message protection before
the affected code is reached, so an attacker must be a malicious or
compromised CMP server, or a man-in-the-middle in possession of the
secret used for message protection. Clients that identify the certificate
to be revoked by a certificate or by issuer and serial number rather
than by a PKCS#10 CSR are not affected.
FIPS impact: no
No FIPS modules are affected by this issue, as the CMP protocol
implementation is outside the OpenSSL FIPS module boundary.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:54 UTC
CWE
- CWE-476 - NULL-pointer dereference
Assigner
openssl
CNA
References
5 references
Impacted products
Date Public
2026-09-29 14:21
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CVE-2026-75618 (GCVE-0-2026-75618)
Vulnerability from cvelistv5 – Published: 2026-08-19 18:30 – Updated: 2026-08-27 23:12
VLAI
EPSS
VEX
Title
RTSP Null Pointer Dereference Denial-of-Service Vulnerability on TP-Link Tapo C100 and C101
Summary
Tapo C100/C101 V5 contains a null pointer dereference vulnerability in the RTSP service. An attacker on the local network can send specially crafted requests that cause the service to dereference an invalid pointer, resulting in a service crash and device reboot. Successful exploitation can disrupt live video streaming functionality and cause a temporary denial-of-service condition.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 19:32 UTC
CWE
- CWE-476 - NULL pointer dereference
Assigner
TPLink
CNA
References
4 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| TP-Link Systems Inc. | Tapo C100 v5 |
Affected:
0 , < 1.5.4 Build 260528 Rel.11462n
(custom)
|
|
| TP-Link Systems Inc. | Tapo C101 v5 |
Affected:
0 , < 1.5.4 Build 260528 Rel.11462n
(custom)
|
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Mitigation MIT-56
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Requirements
Select a programming language that is not susceptible to these issues.
Mitigation
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
Architecture and Design
Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Mitigation
Implementation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
No CAPEC attack patterns related to this CWE.