CVE-2026-59083

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

Affected products

Apache Tomcat

Apache Tomcat

≤ 8.0.0, 8.5.100, 9.0.119, 10.1.56, 11.0.23

Fix

Available

CVSS 3.1

9.1 CRITICAL

EPSS

0.4% (30th percentile)

Weakness

CWE-177

NVD status

Analyzed

Published

2026-07-14