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TI-2026-40362 Aliases CVE-2026-55956GHSA-5v3h-fjv2-54fg

Apache Tomcat: Security constraints for default servlet ignored method

Priority LOW 36CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 18 fixed, 6 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-285.

Summary

Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00695 53rd percentileScored 2026-11-07
Fix Partial org.apache.tomcat.embed:tomcat-embed-core (Maven): 11.0.23, 10.1.56, 9.0.119org.apache.tomcat:tomcat (Maven): 11.0.23, 10.1.56, 9.0.119+1 more productRed Hat: 14 advisoriesRed Hat: 18 fixed, 6 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 – 11.0.22; 10.1.0-M1 – 10.1.55; 9.0.0.M1 – 9.0.118; 8.5.0 – 8.5.100; 7.0.0 – 7.0.109—No fix listedCNA
—org.apache.tomcat.embed:tomcat-embed-core (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat.embed:tomcat-embed-core (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat.embed:tomcat-embed-core (Maven)8.5.0 – 8.5.100—No fix listedGHSA-5v3h-fjv2-54fg
—org.apache.tomcat.embed:tomcat-embed-core (Maven)up to 7.0.109—No fix listedGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat (Maven)8.5.0 – 8.5.100—No fix listedGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat (Maven)up to 7.0.109—No fix listedGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat-catalina (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat-catalina (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat-catalina (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat-catalina (Maven)8.5.0 – 8.5.100—No fix listedGHSA-5v3h-fjv2-54fg
—org.apache.tomcat:tomcat-catalina (Maven)up to 7.0.109—No fix listedGHSA-5v3h-fjv2-54fg
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.22; 10.1.0-M1 – 10.1.55; 9.0.0.M1 – 9.0.118; 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 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-5v3h-fjv2-54fg

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*before 9.0.119; 10.1.0 to before 10.1.56; 11.0.0 to before 11.0.23VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions before 9.0.119; 10.1.0 to before 10.1.56; 11.0.0 to before 11.0.23 Vulnerable ·Apache

Remediation

  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.119 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat (Maven) Fixed in 9.0.119 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat-catalina (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat-catalina (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-5v3h-fjv2-54fg org.apache.tomcat:tomcat-catalina (Maven) Fixed in 9.0.119 Advisory →

Red Hat 14 advisories

  • 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
  • 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
Show 11 more Red Hat advisories
  • 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-2026:43401 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
  • RHSA-2026:32960 Released 2026-06-29 · Red Hat rating Critical
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-1:11.0.23-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.23-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.23-0.1.hum1@src +18
  • RHSA-2026:29203 Released 2026-06-24 · Red Hat rating Critical
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-1:10.1.56-1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.56-1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.56-1.hum1@src +18

Fixed in the same release

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

  • Release ·

    Apache Tomcat 7.0.0

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-40363 Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bindPriority MEDIUM 45
    • TI-2026-36982 Apache Tomcat: XSS in number guess examplePriority LOW 34
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Critical. 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 Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat JBoss Web Server 5AffectedNo fix planned: Out of support scope
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-2026:29203, RHSA-2026:32960
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-2026-55956
  2. 2026-10-03 Alias added: GHSA-5v3h-fjv2-54fg
  3. 2026-11-04 Fix available: Maven/org.apache.tomcat.embed:[email protected], Maven/org.apache.tomcat.embed:[email protected], Maven/org.apache.tomcat.embed:[email protected] +6 · GHSA-5v3h-fjv2-54fg
  4. 2026-11-04 CVSS score added · GHSA-5v3h-fjv2-54fg
  5. 2026-11-04 Weakness changed · GHSA-5v3h-fjv2-54fg
  6. 2026-11-04 10 new references · GHSA-5v3h-fjv2-54fg

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