EUVD-2025-16666
GHSA-6vx8-pcwv-xhf4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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:N/VI:L/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 algorithm confusion attack. Unless the user explicitly limits the expected signature algorithms using the signxml.XMLVerifier.verify(expect_config=...) setting, an attacker may supply a signature unexpectedly signed with a key other than the provided HMAC key, using a different (asymmetric key) signature algorithm. Starting with SignXML 4.0.4, specifying hmac_key causes the set of accepted signature algorithms to be restricted to HMAC only, if not already restricted by the user.
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 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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