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CVE-2026-59083

CriticalPublished

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

Published: Jul 14, 2026
Updated: Jul 14, 2026
Assigning CNA: apache
Evidence observed: Aug 29, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 30.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

1day-archiveResearch
Technical deep-dives and root cause analyses of recently disclosed CVEs - reverse engineering patches, building proof-of-concepts, and documenting exploitation techniques in the 1-day window.

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