Low [CVE-2026-59083] Security constraint bypass via improper URL encoding in rewrite valve
This low-severity Red Hat Linux advisory covers CVE-2026-59083 affecting Red Hat JBoss Web Server 7.0.1, Red Hat JBoss Web Server 7.0 on RHEL 10, Red Hat JBoss Web Server 7.0 on RHEL 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
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.
A remote attacker could exploit this to bypass security constraints in certain configurations, potentially gaining unauthorized access or performing actions that should be restricted. Exploitation requires specific configurations and has high attack complexity, limiting its overall risk to Red Hat products.
Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-807.
Affected Red Hat products: Red Hat JBoss Web Server 7.0.1; Red Hat JBoss Web Server 7.0 on RHEL 10; Red Hat JBoss Web Server 7.0 on RHEL 8; Red Hat JBoss Web Server 7.0 on RHEL 9; Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat JBoss Web Server 5; Red Hat JBoss Web Server 6.
Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
- 11.0.0
- 11.0.23
- 10.1.0
- 10.1.56
- 9.0.0
- 9.0.119
- 8.5.0
- 8.5.100
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- 11.0.24
- 10.1.57
- 9.0.120
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el10jws
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el8jws
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el9jws
- tomcat11-main-11.0.24-0.1.hum1
- tomcat10-main-10.1.57-1.hum1
- RHSA-2026:49952
- RHSA-2026:49951
- RHSA-2026:36872
- RHSA-2026:37767
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- To mitigate this issue, review Apache Tomcat's rewrite valve configurations. If the rewrite valve is not essential for your application, consider disabling it. If it is required, ensure its configuration does not permit improper URL encoding that could lead to security constraint bypasses. A service restart may be required for changes to take effect.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.