SignXML's signature verification with HMAC is vulnerable to a timing attack
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 …
Severity medium: primary CNA CVSS 6.9 v4.0 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2025-06-02T16:23:27.706Z. Updated 2025-06-02T16:41:13.270Z.