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CVE-2026-55957

HighPublished

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

Published: Jun 29, 2026
Updated: Jun 30, 2026
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.3/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS probability estimate

2.9%

Low · next 30 days

Percentile: 86.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2026-55957-PoCPoC
Reproducible Docker lab for the Apache Tomcat JNDIRealm GSSAPI authentication bypass

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