Critical9.1Apache Software Foundation

Critical [CVE-2026-59083] Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security…

This critical-severity Apache Software Foundation advisory covers CVE-2026-59083 affecting Apache Tomcat.

CVE-2026-59083 Published Jul 14, 2026Updated by vendor Jul 14, 2026

CVE-2026-59083

Affected products & platforms

Apache Software FoundationTomcat

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Summary

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 versions

11.0.0-M1 through 11.0.23
10.1.0-M1 through 10.1.56
9.0.0.M1 through 9.0.119
8.5.0 through 8.5.100.
through 8.5.100

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

11.0.24
10.1.57
9.0.120

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-59083 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-59083NVD CVE.org MITRE

Official resources

Apache Tomcat security bulletins (per major version) (target: 11.0.23 / 10.1.56 / 9.0.119)
Official documentation
This advisory names 11.0.23 / 10.1.56 / 9.0.119 as the first fixed releases — official upgrade documentation for Apache Tomcat security bulletins (per major version).
ASF Security — reporting & CVE process
Official documentation
The Apache Software Foundation's official security page: how ASF CVEs are published and where each project's advisories live.
Apache project downloads (fixed releases)
Official documentation
Official ASF download tree — fetch the fixed release named in this advisory from the project's directory.

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