Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-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. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.
Fixed packages 10
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | tomcat | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-admin-webapps | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-docs-webapp | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-el-2.2-api | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-javadoc | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-jsp-2.2-api | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-jsvc | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-lib | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-servlet-3.0-api | 0:7.0.76-10.amzn2.0.17 |
| Amazon Linux · 2 | tomcat-webapps | 0:7.0.76-10.amzn2.0.17 |
Vulnerabilities 1
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High 7.3CVE-2026-55957 Public exploit
Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind
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-…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-55957.html