CVE-2026-59083

CriticalCVSS 9.1

Published: 14/07/2026(UTC)Updated: 14/07/2026(UTC)Translated: 15/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.16%

5th percentile - higher than 5% of all known CVEs

Summary

A vulnerability in Apache Tomcat's rewrite valve allows security constraint bypass due to improper handling of URL hex encoding. Affected versions include 11.0.0-M1 through 11.0.23, 10.1.0-M1 through 10.1.56, 9.0.0-M1 through 9.0.119, and 8.5.0 through 8.5.100.

Risk Assessment

An attacker could exploit this flaw to bypass security rules defined in the rewrite valve, potentially gaining unauthorized access to protected resources.

Recommendation

Upgrade Apache Tomcat to version 11.0.24, 10.1.57, or 9.0.120, which contain the fix.

Original NVD description (English source)

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.