SignXML is an implementation of the W3C XML Signature standard in Python. When verifying signatures ...
Summary
DEBIAN-CVE-2025-48994: SignXML is an implementation of the W3C XML Signature standard in Python. Affects python-signxml versions < 4.0.5+dfsg-1. Fixed in 4.0.5+dfsg-1. How to fix ↓
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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.
How To Fix
Minimum fixed version
4.0.5+dfsg-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-signxmlTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
References
Related vulnerabilities
Recent vulnerabilities recorded for python-signxml.
