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TI-2026-42263 Aliases CVE-2026-59083GHSA-hcjr-322h-429r

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

Priority MEDIUM 48CWE-177Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 18 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00522 44th percentileScored 2026-11-07
Fix Partial Red Hat: 14 advisoriesRed Hat: 18 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Tomcat11.0.0-M1 – 11.0.23; 10.1.0-M1 – 10.1.56; 9.0.0.M1 – 9.0.119; 8.5.0 – 8.5.100—Patch availableCNA
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.23; 10.1.0-M1 – 10.1.56; 9.0.0.M1 – 9.0.119; 8.5.0 – 8.5.100 Fixed in — Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*up to 8.0.0; 8.5.0 – 8.5.100; 9.0.0 – 9.0.119; 10.1.0 – 10.1.56; 11.0.0 – 11.0.23VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions up to 8.0.0; 8.5.0 – 8.5.100; 9.0.0 – 9.0.119; 10.1.0 – 10.1.56; 11.0.0 – 11.0.23 Vulnerable ·Apache

Remediation

Red Hat 14 advisories

  • RHSA-2026:73981 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el10jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el8jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el9jws +7
  • RHSA-2026:73982 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2.5
  • RHSA-2026:68651 Released 2026-09-18 · Red Hat rating Moderate
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat9-1:9.0.120-1.el10_2, tomcat9-admin-webapps-1:9.0.120-1.el10_2, tomcat9-docs-webapp-1:9.0.120-1.el10_2 +5
Show 11 more Red Hat advisories
  • RHSA-2026:68677 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 8) tomcat-1:9.0.120-1.el8_10, tomcat-admin-webapps-1:9.0.120-1.el8_10, tomcat-docs-webapp-1:9.0.120-1.el8_10 +5
  • RHSA-2026:68660 Released 2026-09-17 · Red Hat rating Moderate
    tomcat security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.120-2.el9_8, tomcat-admin-webapps-1:9.0.120-2.el9_8, tomcat-docs-webapp-1:9.0.120-2.el9_8 +5
  • RHSA-2026:68659 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat-1:9.0.120-1.el9_6, tomcat-admin-webapps-1:9.0.120-1.el9_6, tomcat-docs-webapp-1:9.0.120-1.el9_6 +5
  • RHSA-2026:68678 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat-1:9.0.120-1.el9_2, tomcat-admin-webapps-1:9.0.120-1.el9_2, tomcat-docs-webapp-1:9.0.120-1.el9_2 +5
  • RHSA-2026:68679 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat-1:9.0.120-1.el9_4, tomcat-admin-webapps-1:9.0.120-1.el9_4, tomcat-docs-webapp-1:9.0.120-1.el9_4 +5
  • RHSA-2026:68680 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
  • RHSA-2026:67163 Released 2026-09-14 · Red Hat rating Important
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat9-1:9.0.120-1.el10_0, tomcat9-admin-webapps-1:9.0.120-1.el10_0, tomcat9-docs-webapp-1:9.0.120-1.el10_0 +5
  • RHSA-2026:49951 Released 2026-08-05 · Red Hat rating Moderate
    Red Hat JBoss Web Server 7.0.1 release and security update
    • Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat-11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el10jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat-11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el8jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat-11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el9jws +7
  • RHSA-2026:49952 Released 2026-08-05 · Red Hat rating Moderate
    Red Hat JBoss Web Server 7.0.1 release and security update
    • Red Hat JBoss Web Server 7.0.1
  • RHSA-2026:37767 Released 2026-07-10 · Red Hat rating Low
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-1:10.1.57-1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.57-1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.57-1.hum1@src +18
  • RHSA-2026:36872 Released 2026-07-08 · Red Hat rating Low
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-1:11.0.24-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.24-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.24-0.1.hum1@src +18

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat JBoss Web Server 5AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:68651
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:68677
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:68660
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:68680
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:68678
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:68679
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:67163
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:68659
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:68680
Red Hat Hardened ImagesFixed RHSA-2026:36872, RHSA-2026:37767
Red Hat JBoss Web Server 6.2 on RHEL 10Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 8Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 9Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2.5Fixed RHSA-2026:73982
Red Hat JBoss Web Server 7.0 on RHEL 10Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0 on RHEL 8Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0 on RHEL 9Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0.1Fixed RHSA-2026:49952
Not affected: 2 products
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59083
  2. 2026-10-03 Alias added: GHSA-hcjr-322h-429r
  3. 2026-10-09 Fix available: RHSA-2026:49952 · Red Hat
  4. 2026-10-16 Fix available: Red Hat JBoss Web Server 7.0.1 · Red Hat
  5. 2026-11-07 Affected versions changed · Red Hat

References

Advisory 2

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01862 Improper privilege management in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-07192 Improper access control in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09342 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2017-09340 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2026-26741 Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor KEVCVSS 3.1HIGH 7.5
See all 273 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences