Observable discrepancy in XMLSecLibs - #VU145065
Published: August 25, 2026
Vulnerability identifier: #VU145065
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-203
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose encrypted XML content.
The vulnerability exists due to observable discrepancy in symmetric CBC decryption and ISO 10126 unpadding when processing encrypted XML content. A remote attacker can submit crafted ciphertext and distinguish decryption failures to disclose encrypted XML content.
All symmetric and asymmetric decryption failures were distinguishable before normalization to a generic decryption error.
Affected software
XMLSecLibs
Remediation
Install security update from vendor's website.
XMLSecLibs - update to 4.0.0