CVE-2025-48995

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.

The following products are affected by CVE-2025-48995 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2025-48995.

URL	Resource
https://github.com/XML-Security/signxml/commit/1b501faaacf34cf978a52dbc6915ec11e27611cd
https://github.com/XML-Security/signxml/security/advisories/GHSA-gmhf-gg8w-jw42