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Vulnerability · Published Jun 29, 2026 · Assigned by apache

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

High 7.3

In plain English

A high-severity security flaw in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.9% (higher than 87% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)2.9%top 13.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8tomcat1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-admin-webapps1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-docs-webapp1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-el-3.0-api1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-jsp-2.3-api1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-lib1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-servlet-4.0-api1:9.0.120-1.el8_10ALSA-2026:68677
AlmaLinux:8tomcat-webapps1:9.0.120-1.el8_10ALSA-2026:68677
Debian:12tomcat1010.1.52-1~deb12u1DEBIAN-CVE-2026-55957
Debian:13tomcat1010.1.52-1~deb13u1DEBIAN-CVE-2026-55957
Debian:14tomcat1010.1.40-1DEBIAN-CVE-2026-55957
Debian:13tomcat1111.0.15-1~deb13u1DEBIAN-CVE-2026-55957
Debian:14tomcat1111.0.5-1DEBIAN-CVE-2026-55957
Debian:12tomcat99.0.70-2DEBIAN-CVE-2026-55957
Debian:13tomcat99.0.70-2DEBIAN-CVE-2026-55957
Debian:14tomcat99.0.70-2DEBIAN-CVE-2026-55957
Mavenorg.apache.tomcat.embed:tomcat-embed-core10.1.37GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat.embed:tomcat-embed-core9.0.101GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat.embed:tomcat-embed-coreno fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat.embed:tomcat-embed-coreno fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat.embed:tomcat-embed-core11.0.5GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat11.0.5GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat9.0.101GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcatno fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcatno fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat10.1.37GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat-catalina11.0.5GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat-catalinano fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat-catalinano fix listedGHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat-catalina9.0.101GHSA-7895-gffq-w6jq
Mavenorg.apache.tomcat:tomcat-catalina10.1.37GHSA-7895-gffq-w6jq
Rocky Linux:8tomcat1:9.0.120-1.el8_10RLSA-2026:68677
Ubuntu:24.04:LTStomcat10no fix listedUBUNTU-CVE-2026-55957
Ubuntu:25.10tomcat10no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.04:LTStomcat10no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.10tomcat10no fix listedUBUNTU-CVE-2026-55957
Ubuntu:25.10tomcat11no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.04:LTStomcat11no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.10tomcat11no fix listedUBUNTU-CVE-2026-55957
Ubuntu:24.04:LTStomcat9no fix listedUBUNTU-CVE-2026-55957
Ubuntu:25.10tomcat9no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.04:LTStomcat9no fix listedUBUNTU-CVE-2026-55957
Ubuntu:26.10tomcat9no fix listedUBUNTU-CVE-2026-55957

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Tomcat 11.0.0-M1 – through 11.0.410.1.0-M1 – through 10.1.369.0.0.M1 – through 9.0.1008.5.0 – through 8.5.1007.0.0 – through 7.0.109

Weakness: CWE-304 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References