Improper Verification of Cryptographic Signature in XMLSecLibs - #VU145067
Published: August 25, 2026
Vulnerability identifier: #VU145067
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass signature verification.
The vulnerability exists due to improper verification of cryptographic signature in XMLSecurityDSig::locateSignature() and verifyDocument() when processing XML documents containing a DOCTYPE with entity references in Id attributes. A remote attacker can supply a specially crafted XML document to bypass signature verification.
Applications that disable the default DOCTYPE rejection behavior remain exposed, and the issue can cause signature verification to succeed on a different node than the application reads.
Affected software
XMLSecLibs
Remediation
Install security update from vendor's website.
XMLSecLibs - update to 4.0.0