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Vulnerabilities

Vulnerability · CVE-2026-55957

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

Published Jun 29, 2026 · catalog updated Nov 4, 2026 · Apache Tomcat: Authentication bypass

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-55957. EPSS is 2.85%. Act only if a listed version of Apache Tomcat: Authentication bypass is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Apache Tomcat: Authentication bypass).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.85%
Remediation
Version ranges on file
Affected products
Bitnami tomcat · cpe apache/tomcat

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Bitnami tomcat0 → 9.0.101
  • cpe apache/tomcat< 10.1.37
  • cpe apache/tomcat< 11.0.5
  • cpe apache/tomcat< 9.0.101

How to fix CVE-2026-55957

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-55957. EPSS is 2.85%. Act only if a listed version of Apache Tomcat: Authentication bypass is installed.

Which versions are affected?

Compare what you have installed with 0 → 9.0.101, < 10.1.37, < 11.0.5, < 9.0.101. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-304. EPSS 2.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache Tomcat security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 29, 2026 · Monitored products — critical

    Detected

    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. Use

  2. Oct 25, 2026 · Monitored products — critical

    Updated

    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. Use

  3. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    tomcat fixed in 9.0.101

  4. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    tomcat fixed in 9.0.101

  5. Nov 4, 2026 · GitHub Advisory Database

    Updated

    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 through 11.0.4, from 10.1.0 through 10.1.36, from 9.0.0 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are re

Sources

  • CVE.orgVulnerability recordCVE-2026-55957

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-7895-gffq-w6jq

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • Monitored products — criticalVendor advisoryCVE-2026-55957

    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. Use

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryBIT-tomcat-2026-55957

    Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 5, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026