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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2025-48995

SignXML's signature verification with HMAC is vulnerable to a timing attack

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

XML-Security signxml

  • < 4.0.4affected

References