python-signxml: SignXML is an implementation of the W3C XML Signature standard in Python
CVE-2025-48995 is fixed in python-signxml on 1 platform, first by DEBIAN-CVE-2025-48995, released June 2, 2025. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-signxml · Debian 13.5 (trixie) | 4.0.5+dfsg-1 | DEBIAN-CVE-2025-48995 | Jun 2, 2025 |
| python-signxml · Debian 14 | 4.0.5+dfsg-1 | DEBIAN-CVE-2025-48995 | Jun 2, 2025 |
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