CVE-2025-48995
Published: Jun 2, 2025
Modified: Jun 2, 2025
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.
| Vendor | Product | Versions |
|---|---|---|
XML-Security | signxml | affected < 4.0.4 |
Weaknesses (CWE)
References
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