Common Weakness Enumeration
CWE-208
AllowedObservable Timing Discrepancy
Abstraction: Base · Status: Incomplete
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
194 vulnerabilities reference this CWE, most recent first.
CVE-2026-84308 (GCVE-0-2026-84308)
Vulnerability from cvelistv5 – Published: 2026-09-01 19:28 – Updated: 2026-09-03 17:41
VLAI
EPSS
VEX
Title
phpseclib — non-constant-time X25519 scalar multiplication permits full private-key recovery
Summary
phpseclib is a PHP secure communications library. Prior to 3.0.57 and 4.0.1, pure-PHP X25519 scalar multiplication in phpseclib/Math/PrimeField/Integer.php performs data-dependent conditional modular reductions in add() and subtract(). During the Montgomery ladder in phpseclib/Crypt/EC/BaseCurves/Montgomery.php, the reduction behavior of each step depends on the secret scalar prefix, creating per-step timing and libgmp call-count observations that can reveal a reused 251-bit clamped private scalar. The phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php derivation path invokes the pure-PHP multiplication without a native-engine check, while phpseclib/Crypt/EC/Formats/Keys/PKCS8.php reaches it when ext-sodium is unavailable. Exploitation requires a reused or long-lived X25519 private key, knowledge of the corresponding public key, execution of the pure-PHP path, and a local observer capable of resolving individual ladder steps or libgmp entry-point calls. Ephemeral X25519 keys, including phpseclib's normal SSH exchange path, are not affected. Recovery of the scalar permanently compromises operations that reuse that key. This issue is fixed in versions 3.0.57 and 4.0.1.
Severity
6.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 17:41 UTC
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/phpseclib/phpseclib/security/a… | x_refsource_CONFIRM |
| https://github.com/phpseclib/phpseclib/commit/fb5… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
Impacted products
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CVE-2026-83535 (GCVE-0-2026-83535)
Vulnerability from cvelistv5 – Published: 2026-10-12 18:50 – Updated: 2026-10-13 16:09
VLAI
EPSS
VEX
Title
Openstack-network-exporter: basic-auth uses plaintext password storage and non-constant-time comparison
Summary
A flaw was found in openstack-network-exporter. When an operator configures user authentication but omits or misconfigures Transport Layer Security (TLS), the basic authentication mechanism is silently bypassed. This fail-open design allows an adjacent network attacker to access sensitive Open vSwitch (OVS) and Open Virtual Network (OVN) dataplane metrics without credentials. Consequently, an attacker can enumerate bridge names, port counters, OVN controller state, and host topology, leading to information disclosure.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 16:09 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
redhat
CNA
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-83535 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2526402 | issue-trackingx_refsource_REDHAT |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0
|
Date Public
2026-10-12 18:30
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CVE-2026-82449 (GCVE-0-2026-82449)
Vulnerability from cvelistv5 – Published: 2026-08-29 12:05 – Updated: 2026-09-24 14:20
VLAI
EPSS
VEX
Title
Cockpit CMS before 2.14.1 Account Enumeration via Auth Timing
Summary
Cockpit CMS before 2.14.1 contains an account enumeration vulnerability in the auth check endpoint due to timing discrepancies in password verification. Attackers can measure response times across multiple requests to determine which accounts exist by observing that existing accounts trigger bcrypt verification while non-existent accounts return immediately.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 16:34 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
VulnCheck
CNA
References
5 references
| URL | Tags |
|---|---|
| https://github.com/Cockpit-HQ/Cockpit/commit/5d65… | patch |
| https://github.com/Cockpit-HQ/Cockpit | product |
| https://github.com/Cockpit-HQ/Cockpit/blob/2.14.0… | technical-description |
| https://link.mateocallec.com/MFC-2026-001 | third-party-advisory |
| https://www.vulncheck.com/advisories/cockpit-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| cockpit-hq | cockpit |
Affected:
0 , < 2.14.1
(semver)
Unaffected: 2.14.1 (semver) |
Date Public
2026-06-27 00:00
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CVE-2026-81159 (GCVE-0-2026-81159)
Vulnerability from cvelistv5 – Published: 2026-09-02 12:32 – Updated: 2026-09-02 18:59
VLAI
EPSS
VEX
Title
Commerce CyberSource - Moderately critical - Insufficient input validation - SA-CONTRIB-2026-106
Summary
Observable Timing Discrepancy vulnerability in Drupal Commerce CyberSource allows Brute Force. This issue affects Commerce CyberSource versions: from 0.0.0 to 1.10.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 18:59 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
drupal
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Drupal | Commerce CyberSource |
Affected:
0.0.0 , < 1.10.0
(semver)
|
Date Public
2026-08-26 17:35
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CVE-2026-80199 (GCVE-0-2026-80199)
Vulnerability from cvelistv5 – Published: 2026-08-25 23:19 – Updated: 2026-10-08 15:25
VLAI
EPSS
VEX
Title
Kimai before 2.54.0 Username Enumeration via Timing Oracle
Summary
Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated attackers to enumerate valid usernames via X-AUTH-USER header. Attackers can measure response time differences when the password hasher runs only for existing users, enabling username enumeration with no login throttling protection.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 12:07 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/kimai/kimai/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/kimai-before… | third-party-advisory |
Impacted products
Date Public
2026-04-16 00:00
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CVE-2026-78500 (GCVE-0-2026-78500)
Vulnerability from cvelistv5 – Published: 2026-08-27 23:26 – Updated: 2026-08-28 16:37
VLAI
EPSS
VEX
Title
Dimension Blind SSRF via Database Test Connection Feature
Summary
A blind server-side request forgery (SSRF) vulnerability WatchGuard Dimension Database Server Test configuration allows an authenticated privileged attacker to enumerate exposed network services on adjacent network systems.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 16:36 UTC
Assigner
WatchGuard
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://psirt.watchguard.com/CVE-2026-78500 | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WatchGuard | Dimension |
Affected:
2.0 , < 2.3.1
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CVE-2026-77987 (GCVE-0-2026-77987)
Vulnerability from cvelistv5 – Published: 2026-09-22 20:43 – Updated: 2026-09-23 15:26
VLAI
EPSS
VEX
Title
GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery
Summary
A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to internal services listening on other ports of the same appliance. Response bodies were not returned to the requester, but response timing acted as an oracle that allowed instance secrets to be extracted character by character. An extracted secret could then be used in a separate interaction with an internal service to obtain remote code execution on the appliance. Exploitation required network access to the instance and was unauthenticated when private mode was disabled, or required any authenticated user when private mode was enabled. This vulnerability affected GitHub Enterprise Server versions 3.17 through 3.22 and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported through the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:26 UTC
Assigner
GitHub_P
CNA
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
| https://docs.github.com/en/enterprise-server@3.22… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , < 3.17.*
(semver)
Affected: 3.18.0 , < 3.18.* (semver) Affected: 3.19.0 , < 3.19.* (semver) Affected: 3.20.0 , < 3.20.* (semver) Affected: 3.21.0 , < 3.21.* (semver) Affected: 3.22.0 , < 3.22.* (semver) |
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CVE-2026-77696 (GCVE-0-2026-77696)
Vulnerability from cvelistv5 – Published: 2026-09-29 15:32 – Updated: 2026-09-29 16:51
VLAI
EPSS
VEX
Title
Timing Side-Channel in SM2 Signature Generation
Summary
Issue summary: SM2 signature generation uses non-constant-time arithmetic
on secret values, forming a timing side-channel.
Impact summary: An attacker able to measure SM2 signing times may learn
information about the per-signature secret nonce, which over many signatures
can, via a lattice / Hidden Number Problem attack, lead to recovery of the
private key.
CWE: CWE-208: Observable Timing Discrepancy
Description: SM2 signature generation computes the signature value using
variable-time BIGNUM operations on the secret nonce and the private key, so
the time taken to produce an SM2 signature depends on these secret values,
forming a timing side-channel.
Applications performing SM2 signature generation are affected on all
platforms.
FIPS Impact: no
SM2 is not a FIPS algorithm.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:51 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
openssl
CNA
References
5 references
Impacted products
Date Public
2026-09-29 14:21
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CVE-2026-77582 (GCVE-0-2026-77582)
Vulnerability from cvelistv5 – Published: 2026-09-21 16:43 – Updated: 2026-09-23 19:16
VLAI
EPSS
VEX
Title
Tinyauth: User enumeration attack by timing oracle
Summary
Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/user_controller.go loginHandler and internal/middleware/context_middleware.go basicAuth return quickly after internal/service/auth_service.go reports a missing user, while an existing user causes bcrypt password verification work. Repeated measurements can therefore disclose valid usernames and support targeted credential attacks. This issue is fixed in version 5.1.0.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 19:16 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/tinyauthapp/tinyauth/security/… | x_refsource_CONFIRM |
| https://github.com/tinyauthapp/tinyauth/pull/1004 | x_refsource_MISC |
| https://github.com/tinyauthapp/tinyauth/commit/c2… | x_refsource_MISC |
| https://github.com/tinyauthapp/tinyauth/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| tinyauthapp | tinyauth |
Affected:
< 5.1.0
|
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CVE-2026-75589 (GCVE-0-2026-75589)
Vulnerability from cvelistv5 – Published: 2026-08-19 07:20 – Updated: 2026-08-26 19:44
VLAI
EPSS
VEX
Title
Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify
Summary
Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify.
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A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 19:43 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
CPANSec
CNA
References
4 references
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No mitigation information available for this CWE.
CAPEC-462: Cross-Domain Search Timing
An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
CAPEC-541: Application Fingerprinting
An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
CAPEC-580: System Footprinting
An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.