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TI-2026-31687 Aliases CVE-2026-43513GHSA-5mp6-jrq3-r938

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Priority LOW 39CWE-178Published · Updated

Key facts

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

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

Summary

Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00503 43rd percentileScored 2026-11-07
Fix Partial org.apache.tomcat.embed:tomcat-embed-core (Maven): 9.0.118, 10.1.55, 11.0.22org.apache.tomcat:tomcat (Maven): 9.0.118, 10.1.55, 11.0.22+1 more productRed Hat: 16 advisoriesRed Hat: 18 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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 – 11.0.21; 10.1.0-M1 – 10.1.54; 9.0.0.M1 – 9.0.117; 8.5.0 – 8.5.100; 7.0.0 – 7.0.109—No fix listedCNA
—org.apache.tomcat.embed:tomcat-embed-core (Maven)before 9.0.1189.0.118Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.5510.1.55Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat.embed:tomcat-embed-core (Maven)11.0.0-M1 to before 11.0.2211.0.22Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat (Maven)before 9.0.1189.0.118Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat (Maven)10.1.0-M1 to before 10.1.5510.1.55Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat (Maven)11.0.0-M1 to before 11.0.2211.0.22Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat-catalina (Maven)before 9.0.1189.0.118Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat-catalina (Maven)10.1.0-M1 to before 10.1.5510.1.55Patch availableGHSA-5mp6-jrq3-r938
—org.apache.tomcat:tomcat-catalina (Maven)11.0.0-M1 to before 11.0.2211.0.22Patch availableGHSA-5mp6-jrq3-r938
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.21; 10.1.0-M1 – 10.1.54; 9.0.0.M1 – 9.0.117; 8.5.0 – 8.5.100; 7.0.0 – 7.0.109 Fixed in — No fix listed CNA
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected before 9.0.118 Fixed in 9.0.118 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.55 Fixed in 10.1.55 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.22 Fixed in 11.0.22 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected before 9.0.118 Fixed in 9.0.118 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.55 Fixed in 10.1.55 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.22 Fixed in 11.0.22 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected before 9.0.118 Fixed in 9.0.118 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.55 Fixed in 10.1.55 Patch available GHSA-5mp6-jrq3-r938
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.22 Fixed in 11.0.22 Patch available GHSA-5mp6-jrq3-r938

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*7.0.0 – 7.0.109; 8.5.0 – 8.5.100; 9.0.0 to before 9.0.118; 10.1.0 to before 10.1.55; 11.0.0 to before 11.0.22VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 7.0.0 – 7.0.109; 8.5.0 – 8.5.100; 9.0.0 to before 9.0.118; 10.1.0 to before 10.1.55; 11.0.0 to before 11.0.22 Vulnerable ·Apache

Remediation

  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.118 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.55 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.22 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat (Maven) Fixed in 9.0.118 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat (Maven) Fixed in 10.1.55 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat (Maven) Fixed in 11.0.22 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 9.0.118 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 10.1.55 Advisory →
  • Fix · GHSA-5mp6-jrq3-r938 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 11.0.22 Advisory →

Red Hat 16 advisories

  • RHSA-2026:69259 Released 2026-09-21 · Red Hat rating Moderate
    tomcat update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat-1:10.1.49-4.el10_2, tomcat-admin-webapps-1:10.1.49-4.el10_2, tomcat-docs-webapp-1:10.1.49-4.el10_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
  • 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
Show 13 more Red Hat advisories
  • 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-2026:67164 Released 2026-09-14 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat-1:10.1.49-1.el10_0, tomcat-admin-webapps-1:10.1.49-1.el10_0, tomcat-docs-webapp-1:10.1.49-1.el10_0 +5
  • RHSA-2026:44427 Released 2026-07-23 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-1:11.0.24-0.2.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.24-0.2.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.24-0.2.hum1@src +18
  • RHSA-2026:44426 Released 2026-07-23 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-1:10.1.57-3.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.57-3.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.57-3.1.hum1@src +18
  • RHSA-2026:43401 Released 2026-07-22 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.4 release and security update
    • Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-10.1.49-15.redhat_00013.1.el10jws, jws6-tomcat-admin-webapps-10.1.49-15.redhat_00013.1.el10jws, jws6-tomcat-docs-webapp-10.1.49-15.redhat_00013.1.el10jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-10.1.49-15.redhat_00013.1.el8jws, jws6-tomcat-admin-webapps-10.1.49-15.redhat_00013.1.el8jws, jws6-tomcat-docs-webapp-10.1.49-15.redhat_00013.1.el8jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-10.1.49-15.redhat_00013.1.el9jws, jws6-tomcat-admin-webapps-10.1.49-15.redhat_00013.1.el9jws, jws6-tomcat-docs-webapp-10.1.49-15.redhat_00013.1.el9jws +7
  • RHSA-2026:43402 Released 2026-07-22 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.4 release and security update
    • Red Hat JBoss Web Server 6.2.4
  • RHSA-2026:39188 Released 2026-07-14 · Red Hat rating Important
    Red Hat JBoss Web Server 7.0.0 security release
    • Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat-11.0.21-5.redhat_00004.1.el10jws, jws7-tomcat-admin-webapps-11.0.21-5.redhat_00004.1.el10jws, jws7-tomcat-docs-webapp-11.0.21-5.redhat_00004.1.el10jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat-11.0.21-5.redhat_00004.1.el8jws, jws7-tomcat-admin-webapps-11.0.21-5.redhat_00004.1.el8jws, jws7-tomcat-docs-webapp-11.0.21-5.redhat_00004.1.el8jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat-11.0.21-5.redhat_00004.1.el9jws, jws7-tomcat-admin-webapps-11.0.21-5.redhat_00004.1.el9jws, jws7-tomcat-docs-webapp-11.0.21-5.redhat_00004.1.el9jws +7
  • RHSA-2026:39189 Released 2026-07-14 · Red Hat rating Important
    Red Hat JBoss Web Server 7.0.0 security release
    • Red Hat JBoss Web Server 7.0.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apache Tomcat 7.00

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-31688 Apache Tomcat: AJP secret compared in non-constant timePriority LOW 18
    Show all 2 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:68651, RHSA-2026:69259
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, RHSA-2026:67164
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-2026:44426, RHSA-2026:44427
Red Hat JBoss Web Server 6.2 on RHEL 10Fixed RHSA-2026:43401
Red Hat JBoss Web Server 6.2 on RHEL 8Fixed RHSA-2026:43401
Red Hat JBoss Web Server 6.2 on RHEL 9Fixed RHSA-2026:43401
Red Hat JBoss Web Server 6.2.4Fixed RHSA-2026:43402
Red Hat JBoss Web Server 7.0 on RHEL 10Fixed RHSA-2026:39188
Red Hat JBoss Web Server 7.0 on RHEL 8Fixed RHSA-2026:39188
Red Hat JBoss Web Server 7.0 on RHEL 9Fixed RHSA-2026:39188
Red Hat JBoss Web Server 7.0.0Fixed RHSA-2026:39189
Not affected: 3 products
  • 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

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43513
  2. 2026-10-03 Alias added: GHSA-5mp6-jrq3-r938

References

Advisory 3

Other 7

  • 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