Paper/Archive/CVE-2026-59083

CVE-2026-59083

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

EPSS 0.5%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (ADP)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 44.3.443 × 208.9 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Apache Tomcat11.0.0-M1 – 11.0.23–CNA

Apache Tomcat10.1.0-M1 – 10.1.56–CNA

Apache Tomcat9.0.0.M1 – 9.0.119–CNA

Apache Tomcat8.5.0 – 8.5.100–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq refopenwall.com/lists/oss-security/2026/07/14/7