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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.

PUBLISHED Reserved 2026-07-02 | Published 2026-07-14 | Updated 2026-07-14 | Assigner apache

Problem types

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

Product status

Default status
unaffected

11.0.0-M1 (semver)
affected

10.1.0-M1 (semver)
affected

9.0.0.M1 (semver)
affected

8.5.0 (semver)
affected

Any version before 8.0.0
unaffected

References

www.openwall.com/lists/oss-security/2026/07/14/7

lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq vendor-advisory

cve.org (CVE-2026-59083)

nvd.nist.gov (CVE-2026-59083)

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