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CVE-2025-48995
Good to know:
Date: June 2, 2025
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.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Observable Timing Discrepancy
CWE-208Top Fix
Upgrade Version
Upgrade to version signxml - 4.0.4;https://github.com/XML-Security/signxml.git - v4.0.4
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | NONE |