EUVD-2025-16676
GHSA-gmhf-gg8w-jw42
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Lifecycle Timeline
4DescriptionGitHub Advisory
SignXML is an implementation of the W3C XML Signature standard in Python. When verifying signatures with X509 certificate validation turned off and HMAC shared secret set (signxml.XMLVerifier.verify(require_x509=False, hmac_key=...), versions of SignXML prior to 4.0.4 are vulnerable to a potential timing attack. The verifier may leak information about the correct HMAC when comparing it with the user supplied hash, allowing users to reconstruct the correct HMAC for any data.
AnalysisAI
A security vulnerability in SignXML (CVSS 6.9). Remediation should follow standard vulnerability management procedures.
Technical ContextAI
Vulnerability type not specified by vendor. Affects SignXML.
RemediationAI
Monitor vendor channels for patch availability.
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Same weakness CWE-208 – Observable Timing Discrepancy
View allSame technique Information Disclosure
View allVendor StatusVendor
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| focal | DNE | - |
| jammy | DNE | - |
| noble | DNE | - |
| oracular | DNE | - |
| upstream | needs-triage | - |
| plucky | ignored | end of life, was needs-triage |
| questing | needs-triage | - |
Debian
Bug #1107195| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| trixie | fixed | 4.0.5+dfsg-2 | - |
| forky, sid | fixed | 4.2.0+dfsg-1 | - |
| (unstable) | fixed | 4.0.5+dfsg-1 | - |
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External POC / Exploit Code
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