CVE-2026-59083

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

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

Weaknesses (CWE)

• CWE-177

European references

• ENISA EUVD · EUVD-2026-43638
• GCVE · GCVE-0-2026-59083

CERT-FR advisories

• CERTFR-2026-AVI-1336 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1206 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1094 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0876 — Multiples vulnérabilités dans Apache Tomcat · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≤ 8.0.0
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 8.5.0 ≤ 8.5.100
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 9.0.0 ≤ 9.0.119
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 10.1.0 ≤ 10.1.56
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 11.0.0 ≤ 11.0.23

Affected products

References

• https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq
• http://www.openwall.com/lists/oss-security/2026/07/14/7

Sources