Information Exposure Affecting python-signxml package, versions <4.0.5+dfsg-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-PYTHONSIGNXML-10292752
- published3 Jun 2025
- disclosed2 Jun 2025
Introduced: 2 Jun 2025
CVE-2025-48995 (opens in a new tab)How to fix?
Upgrade Debian:13 python-signxml to version 4.0.5+dfsg-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-signxml package and not the python-signxml package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
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.