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TI-2026-40363 Aliases CVE-2026-55957GHSA-7895-gffq-w6jq

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

Priority MEDIUM 45CWE-304Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 10 fixed, 2 without a fix

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

Summary

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02855 86th percentileScored 2026-11-07
Fix Partial org.apache.tomcat.embed:tomcat-embed-core (Maven): 11.0.5, 10.1.37, 9.0.101org.apache.tomcat:tomcat (Maven): 11.0.5, 10.1.37, 9.0.101+1 more productRed Hat: 12 advisoriesRed Hat: 10 fixed, 2 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 – 11.0.4; 10.1.0-M1 – 10.1.36; 9.0.0.M1 – 9.0.100; 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 11.0.511.0.5Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.3710.1.37Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat.embed:tomcat-embed-core (Maven)9.0.0.M1 to before 9.0.1019.0.101Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat.embed:tomcat-embed-core (Maven)8.5.0 – 8.5.100—No fix listedGHSA-7895-gffq-w6jq
—org.apache.tomcat.embed:tomcat-embed-core (Maven)up to 7.0.109—No fix listedGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat (Maven)11.0.0-M1 to before 11.0.511.0.5Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat (Maven)10.1.0-M1 to before 10.1.3710.1.37Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat (Maven)9.0.0.M1 to before 9.0.1019.0.101Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat (Maven)8.5.0 – 8.5.100—No fix listedGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat (Maven)up to 7.0.109—No fix listedGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat-catalina (Maven)11.0.0-M1 to before 11.0.511.0.5Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat-catalina (Maven)10.1.0-M1 to before 10.1.3710.1.37Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat-catalina (Maven)9.0.0.M1 to before 9.0.1019.0.101Patch availableGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat-catalina (Maven)8.5.0 – 8.5.100—No fix listedGHSA-7895-gffq-w6jq
—org.apache.tomcat:tomcat-catalina (Maven)up to 7.0.109—No fix listedGHSA-7895-gffq-w6jq
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.4; 10.1.0-M1 – 10.1.36; 9.0.0.M1 – 9.0.100; 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 11.0.5 Fixed in 11.0.5 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.37 Fixed in 10.1.37 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.101 Fixed in 9.0.101 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-7895-gffq-w6jq
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.5 Fixed in 11.0.5 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.37 Fixed in 10.1.37 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.101 Fixed in 9.0.101 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.5 Fixed in 11.0.5 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.37 Fixed in 10.1.37 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.101 Fixed in 9.0.101 Patch available GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-7895-gffq-w6jq
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected up to 7.0.109 Fixed in — No fix listed GHSA-7895-gffq-w6jq

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*before 9.0.101; 10.1.0 to before 10.1.37; 11.0.0 to before 11.0.5VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions before 9.0.101; 10.1.0 to before 10.1.37; 11.0.0 to before 11.0.5 Vulnerable ·Apache

Remediation

  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.5 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.37 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.101 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat (Maven) Fixed in 11.0.5 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat (Maven) Fixed in 10.1.37 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat (Maven) Fixed in 9.0.101 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat-catalina (Maven) Fixed in 11.0.5 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat-catalina (Maven) Fixed in 10.1.37 Advisory →
  • Fix · GHSA-7895-gffq-w6jq org.apache.tomcat:tomcat-catalina (Maven) Fixed in 9.0.101 Advisory →

Red Hat 12 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-2026:68659 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
Show 9 more Red Hat advisories
  • 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-2026:32960 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
  • RHSA-2026:18916 Released 2026-05-19 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.110-2.el9_8, tomcat-admin-webapps-1:9.0.110-2.el9_8, tomcat-docs-webapp-1:9.0.110-2.el9_8 +5
  • RHSA-2026:18537 Released 2026-05-19 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat-1:10.1.49-1.el10, tomcat-admin-webapps-1:10.1.49-1.el10, tomcat-docs-webapp-1:10.1.49-1.el10 +5
  • RHSA-2026:18536 Released 2026-05-19 · Red Hat rating Important
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat9-1:9.0.110-2.el10_2, tomcat9-admin-webapps-1:9.0.110-2.el10_2, tomcat9-docs-webapp-1:9.0.110-2.el10_2 +5

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-2026-40362 Apache Tomcat: Security constraints for default servlet ignored methodPriority LOW 36
    • TI-2026-36982 Apache Tomcat: XSS in number guess examplePriority LOW 34
    Show all 3 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat JBoss Web Server 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:18536, RHSA-2026:18537
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:68677
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:18916
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-2026:29203, RHSA-2026:32960
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55957
  2. 2026-10-03 Alias added: GHSA-7895-gffq-w6jq
  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-7895-gffq-w6jq
  4. 2026-11-04 CVSS score added · GHSA-7895-gffq-w6jq
  5. 2026-11-04 Weakness changed · GHSA-7895-gffq-w6jq
  6. 2026-11-04 10 new references · GHSA-7895-gffq-w6jq

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