CVE-2026-59083

Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass

State: Published
Severity: 9.1 Critical
Published: Jul 14, 2026
Updated: Jul 14, 2026
Reserved: Jul 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-177 Improper Handling of URL Encoding (Hex Encoding)

Affected Products

Product	Versions
Apache TomcatApache Software Foundation	11.0.0-M1 through 11.0.23Affected 10.1.0-M1 through 10.1.56Affected 9.0.0.M1 through 9.0.119Affected 8.5.0 through 8.5.100Affected before 8.0.0Not affected

References

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