AIKIDO-2026-614529
robrichards/xmlseclibs is vulnerable to Signature Verification Bypass
50
Medium Risk
This Affects:
robrichards/xmlseclibsTL;DR
XML signature verification in XMLSecurityDSig does not reject documents that carry a DOCTYPE. A crafted Id attribute that references an XML entity is expanded by getAttribute() but is invisible to the libxml2 XPath lookup used to locate the signed node, so verification can succeed against a different node than the application later reads. This allows signed-content confusion to slip a substituted node past an otherwise valid signature. The fix makes locateSignature() reject documents that contain a DOCTYPE by default through the new forbidDoctype behavior.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you verify XML signatures on documents from untrusted sources.
Background info
robrichards/xmlseclibs is vulnerable to Signature Verification Bypass in versions 0.0.1 - 3.1.5.
How to fix this
Upgrade the robrichards/xmlseclibs library to the patch version.
Are You Affected?
Connect your repositories to instantly see whether vulnerable or malicious packages exist in your codebase.
Free. No credit card required.
I consent to receiving marketing communications based on Aikido’s Privacy Policy.
SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
FedRAMPImplementing© All Intel data is openly available and commercially licensed.