What’s Vulnerable › Vulnerabilities

CVE-2026-55957: Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-29 · updated 2026-10-25
• Weakness: CWE-304

Description

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.

Affected products

• Apache Tomcat: before 9.0.101; from 10.1.0 before 10.1.37; from 11.0.0 before 11.0.5 — fixed in 9.0.101, 10.1.37, 11.0.5

How to fix

Upgrade to a fixed version: Apache Tomcat 9.0.101, 10.1.37, 11.0.5. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh
• http://www.openwall.com/lists/oss-security/2026/06/29/26

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