Common Weakness Enumeration
CWE-416
AllowedUse After Free
Abstraction: Variant · Status: Stable
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
3574 vulnerabilities reference this CWE, most recent first.
CVE-2026-77505 (GCVE-0-2026-77505)
Vulnerability from cvelistv5 – Published: 2026-09-08 17:13 – Updated: 2026-10-31 16:12
VLAI
EPSS
VEX
Title
Windows DNS Server Remote Code Execution Vulnerability
Summary
Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
- CWE-416 - Use After Free
Assigner
microsoft
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
13 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.9200.0 , < 6.2.9200.26349
(custom)
|
|
| Microsoft | Windows Server 2012 (Server Core installation) |
Affected:
6.2.9200.0 , < 6.2.9200.26349
(custom)
|
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.9600.0 , < 6.3.9600.23398
(custom)
|
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
Affected:
6.3.9600.0 , < 6.3.9600.23398
(custom)
|
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.5622
(custom)
|
|
| Microsoft | Windows Server 2025 |
Affected:
10.0.26100.0 , < 10.0.26100.33438
(custom)
|
|
| Microsoft | Windows Server 2025 (Server Core installation) |
Affected:
10.0.26100.0 , < 10.0.26100.33438
(custom)
|
Date Public
2026-09-08 14:00
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CVE-2026-77485 (GCVE-0-2026-77485)
Vulnerability from cvelistv5 – Published: 2026-09-08 17:18 – Updated: 2026-10-31 16:16
VLAI
EPSS
VEX
Title
SQL Server Elevation of Privilege Vulnerability
Summary
Use after free in SQL Server allows an authorized attacker to elevate privileges locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 04:26 UTC
CWE
- CWE-416 - Use After Free
Assigner
microsoft
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft SQL Server 2017 (CU 31) |
Affected:
14.0.0 , < 14.0.3550.4
(custom)
|
|
| Microsoft | Microsoft SQL Server 2017 (GDR) |
Affected:
14.0.0 , < 14.0.2130.4
(custom)
|
|
| Microsoft | Microsoft SQL Server 2019 (CU 32) |
Affected:
15.0.0.0 , < 15.0.4490.9
(custom)
|
|
| Microsoft | Microsoft SQL Server 2019 (GDR) |
Affected:
15.0.0 , < 15.0.2190.7
(custom)
|
|
| Microsoft | Microsoft SQL Server 2022 (CU 26) |
Affected:
16.0.0.0 , < 16.0.4275.2
(custom)
|
|
| Microsoft | Microsoft SQL Server 2022 (GDR) |
Affected:
16.0.0 , < 16.0.1200.5
(custom)
|
|
| Microsoft | Microsoft SQL Server 2025 (CU8) |
Affected:
17.0.0.0 , < 17.0.4085.5
(custom)
|
|
| Microsoft | Microsoft SQL Server 2025 for x64-based Systems (GDR) |
Affected:
17.0.1050.2 , < 17.0.1135.8
(custom)
|
Date Public
2026-09-08 14:00
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CVE-2026-77358 (GCVE-0-2026-77358)
Vulnerability from cvelistv5 – Published: 2026-08-27 22:37 – Updated: 2026-08-31 18:25
VLAI
EPSS
VEX
Title
cpp-httplib: Use-after-free of TLS session in WebSocketClient::shutdown_and_close()
Summary
cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:25 UTC
CWE
- CWE-416 - Use After Free
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/yhirose/cpp-httplib/security/a… | x_refsource_CONFIRM |
| https://github.com/yhirose/cpp-httplib/commit/2f9… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| yhirose | cpp-httplib |
Affected:
>= 0.33.0, < 0.50.
|
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CVE-2026-77235 (GCVE-0-2026-77235)
Vulnerability from cvelistv5 – Published: 2026-08-21 17:42 – Updated: 2026-08-27 16:46
VLAI
EPSS
VEX
Title
Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
Summary
Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 16:08 UTC
CWE
- CWE-416 - Use after free
Assigner
AMZN
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/FreeRTOS/FreeRTOS-Kernel/relea… | patch |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/FreeRTOS/FreeRTOS-Kernel/secur… | third-party-advisory |
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1 product
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|---|---|---|---|
| FreeRTOS | FreeRTOS-Kernel |
Affected:
10.2.0 , ≤ 11.3.0
(custom)
cpe:2.3:a:freertos:freertos-kernel:*:*:*:*:*:*:*:* |
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CVE-2026-76957 (GCVE-0-2026-76957)
Vulnerability from cvelistv5 – Published: 2026-08-20 04:28 – Updated: 2026-08-20 15:26
VLAI
EPSS
VEX
Summary
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 15:05 UTC
CWE
- CWE-416 - Use After Free
Assigner
mitre
CNA
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.8.4
(semver)
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* |
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CVE-2026-76921 (GCVE-0-2026-76921)
Vulnerability from cvelistv5 – Published: 2026-08-19 22:45 – Updated: 2026-08-20 15:26
VLAI
EPSS
VEX
Title
Use After Free in Wireshark
Summary
CMS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 15:07 UTC
CWE
- CWE-416 - Use After Free
Assigner
GitLab
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Wireshark Foundation | Wireshark |
Affected:
4.6.0 , < 4.6.8
(semver)
Affected: 4.4.0 , < 4.4.18 (semver) |
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CVE-2026-76875 (GCVE-0-2026-76875)
Vulnerability from cvelistv5 – Published: 2026-09-29 12:45 – Updated: 2026-11-08 14:08 X_Open Source
VLAI
EPSS
VEX
Title
PyPy pyexpat ExternalEntityParserCreate Use-After-Free
Summary
PyPy before versions 3.11.16 and 3.12.14 contains a use-after-free vulnerability in the pyexpat module's ExternalEntityParserCreate function that allows attackers to corrupt memory by supplying a crafted XML document to applications that create external-entity sub-parsers without retaining a reference to the parent parser. The child parser retains a raw C back-pointer to the parent parser struct while PyPy's tracing garbage collector can free the parent's C struct, causing bundled libexpat to dereference the freed pointer on every parsed token, producing memory corruption.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 12:07 UTC
CWE
- CWE-416 - Use After Free
Assigner
VulnCheck
CNA
References
4 references
| URL | Tags |
|---|---|
| https://doc.pypy.org/release-v8.0.0.html | release-notes |
| https://github.com/pypy/pypy/releases/tag/release… | patchrelease-notes |
| https://github.com/pypy/pypy/releases/tag/release… | patchrelease-notes |
| https://www.vulncheck.com/advisories/pypy-pyexpat… | third-party-advisory |
Impacted products
Date Public
2026-09-19 00:00
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CVE-2026-74766 (GCVE-0-2026-74766)
Vulnerability from cvelistv5 – Published: 2026-09-22 07:19 – Updated: 2026-09-22 12:41
VLAI
EPSS
VEX
Title
Net::IDN::Punycode versions from 2.301 before 2.590 for Perl allow a heap use-after-free via a decoded code point that reallocates the output buffer in decode_punycode
Summary
Net::IDN::Punycode versions from 2.301 before 2.590 for Perl allow a heap use-after-free via a decoded code point that reallocates the output buffer in decode_punycode.
The XS backend inserts each decoded code point into the string buffer of the scalar it returns. decode_punycode computes the insertion pointer first and only then grows the buffer when the code point does not fit. The growth reallocates the buffer and updates every pointer except the insertion pointer, so the move that follows and the write of the code point go through a freed pointer. The buffer starts at twice the label length, and a code point above U+FFFF takes four bytes in the output, so a label of such code points outgrows it and forces the reallocation.
Version 2.301, the fix for CVE-2016-15059, introduced the defect. Only the XS backend is affected.
Decoding an attacker-supplied punycode label reads and writes freed heap memory.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 12:41 UTC
CWE
- CWE-416 - Use After Free
Assigner
CPANSec
CNA
References
4 references
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CVE-2026-74758 (GCVE-0-2026-74758)
Vulnerability from cvelistv5 – Published: 2026-10-21 11:48 – Updated: 2026-10-30 16:47
VLAI
EPSS
VEX
Title
Apache bRPC: Heap Use-After-Free in RTMP Abort Message Handling
Summary
A heap use-after-free in the RTMP protocol component of Apache bRPC (versions < 1.18.0) allows a remote attacker to crash a bRPC RTMP server by sending a crafted Abort control message. No authentication or application-level request is required.
Root Cause:
When an RTMP Abort control message names the chunk stream that is currently being parsed (the chunk stream carrying the message itself), RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the RtmpChunkStream while its Feed() is still running. After the message handler returns, Feed() continues to access members of the deleted object, resulting in a heap-use-after-free.
Affected Scenarios:
bRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.
How to Fix:
1. Upgrade bRPC to version 1.18.0, which fixes this issue.
2. Apply this patch: https://github.com/apache/brpc/pull/3452
The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 16:45 UTC
CWE
- CWE-416 - Use After Free
Assigner
apache
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/2pf15ojj0vr7rtx95… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache bRPC |
Affected:
0 , < 1.18.0
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CVE-2026-74222 (GCVE-0-2026-74222)
Vulnerability from cvelistv5 – Published: 2026-09-29 21:29 – Updated: 2026-10-02 12:30
VLAI
EPSS
VEX
Title
U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
Summary
U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 12:30 UTC
CWE
- CWE-416 - Use After Free
Assigner
VulnCheck
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/u-boot/u-boot/commit/2d94618a5… | patch |
| https://github.com/u-boot/u-boot/blob/v2026.07/ne… | technical-description |
| https://github.com/u-boot/u-boot | product |
| https://www.vulncheck.com/advisories/u-boot-befor… | third-party-advisory |
Impacted products
Date Public
2026-09-01 00:00
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"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW"
},
"format": "CVSS"
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
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"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
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"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-29T21:29:23.960Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
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"references": [
{
"tags": [
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"url": "https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616"
},
{
"tags": [
"technical-description"
],
"url": "https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194"
},
{
"tags": [
"product"
],
"url": "https://github.com/u-boot/u-boot"
},
{
"name": "VulnCheck Advisory: U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback"
}
],
"title": "U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-74222",
"datePublished": "2026-09-29T21:29:23.960Z",
"dateReserved": "2026-08-14T18:01:19.916Z",
"dateUpdated": "2026-10-02T12:30:17.284Z",
"state": "PUBLISHED"
},
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}
Mitigation
Architecture and Design
Strategy: Language Selection
Choose a language that provides automatic memory management.
Mitigation
Implementation
Strategy: Attack Surface Reduction
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
No CAPEC attack patterns related to this CWE.