Inefficient Algorithmic Complexity in Java HTML Sanitizer - #VU152249
Published: September 25, 2026
Vulnerability identifier: #VU152249
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-407
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 inefficient algorithmic complexity in the CSS lexer when processing a run of unmatched close brackets after a run of open brackets. A remote attacker can submit CSS containing a long sequence of open brackets followed by unmatched close brackets to cause a denial of service.
Affected software
Java HTML Sanitizer
Remediation
Install security update from vendor's website.
Java HTML Sanitizer - update to 20260924.1