Information Exposure Through Timing Discrepancy in XMLSecLibs - #VU145061
Published: August 25, 2026
Vulnerability identifier: #VU145061
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-208
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to recover valid message authentication codes.
The vulnerability exists due to an observable timing discrepancy in XMLSecurityKey::verifySignature() when verifying HMAC-SHA1 signatures. A remote attacker can measure response timing differences to recover valid message authentication codes.
Exploitation may be possible byte-by-byte under favorable network conditions.
Affected software
XMLSecLibs
Remediation
Install security update from vendor's website.
XMLSecLibs - update to 4.0.0