Security Advisory

CVE-2025-48995

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2025-06-02 16:23:27

Last updated 2025-06-02 16:41:13

Assigner GitHub_M

CVSS score 6.9

State PUBLISHED

Description

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.

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