Medium severityOSV Advisory· Published Jun 2, 2025· Updated Apr 15, 2026
CVE-2025-48995
CVE-2025-48995
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
signxmlPyPI | < 4.0.4 | 4.0.4 |
Affected products
2- Range: v0.1.0, v0.1.3, v0.1.4, …
Patches
Vulnerability mechanics
References
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