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Advisory record · GHSA-c4cc-x928-vjw9

robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation

CVSS 6.0 MediumEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 8 Dec 2025, 17:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
robrichards/xmlseclibsPackagist<3.1.43.1.4
Identifiers
GHSA-c4cc-x928-vjw9 · CVE-2025-66578 · PKSA-pcdf-qvqm-w4tv
Weakness (CWE)
CWE-248
Tags
Published
8 Dec 2025
Updated
9 Dec 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The robrichards/xmlseclibs Packagist package versions before 3.1.4 are affected. When libxml2 canonicalization fails on invalid XML, the library can compute a digest over an empty string and treat it as successful, which may let an attacker pass digest or signature checks and replay a previously created signature. The source gives few details on the exact conditions required. Upgrade to version 3.1.4 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.0 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:26 UTC First seen by agentprime
  2. 31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.