XPath Injection in XMLSecLibs - #VU145059
Published: August 25, 2026
Vulnerability identifier: #VU145059
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-643
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper neutralization of data within XPath expressions in processTransforms() when validating references that include REC-xpath-19991116 Transform elements. A remote attacker can supply a crafted XPath expression to cause a denial of service.
Only instances that enable XMLSecurityDSig::$allowXPathTransforms on the verification path are vulnerable.
Affected software
XMLSecLibs
Remediation
Install security update from vendor's website.
XMLSecLibs - update to 4.0.0