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Ubuntu 26.04 Tomcat Critical DoS and Authentication Bypass Vuln 8417-1

ubuntu
Calendar Grey June 10, 2026
Dist Ubuntu Esm H88
Address multiple security concerns with Tomcat in Ubuntu 20.04 to 26.04 for safer usage. Update as advised.
Several security issues were fixed in Tomcat.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Tomcat. Software Description: - tomcat10: Servlet and JSP engine - tomcat9: Servlet and JSP engine Details: It was discovered that Tomcat did not properly limit the size of WebDAV LOCK and PROPFIND request bodies. A remote attacker could use this issue to cause Tomcat to consume excessive memory, resulting in a denial of service. (CVE-2026-41284) It was discovered that Tomcat incorrectly validated HTTP/2 header fields. A remote attacker could use this issue to cause Tomcat to crash or possibly execute arbitrary code. (CVE-2026-41293) It was discovered that Tomcat did not properly clear HTTP authentication headers during WebSocket connection upgrades and redirects. A remote attacker could use this issue to obtain sensitive credentials. (CVE-2026-42498) ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory DoS Ubuntu tomcat arbitrary execution bypass authentication

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libtomcat10-embed-java 10.1.40-1ubuntu1.26.04.1 libtomcat10-java 10.1.40-1ubuntu1.26.04.1 libtomcat9-java 9.0.115-1ubuntu0.1 tomcat10 10.1.40-1ubuntu1.26.04.1 Ubuntu 25.10 libtomcat10-embed-java 10.1.40-1ubuntu1.25.10.1 libtomcat10-java 10.1.40-1ubuntu1.25.10.1 libtomcat9-java 9.0.95-1ubuntu1.1 tomcat10 10.1.40-1ubuntu1.25.10.1 Ubuntu 24.04 LTS libtomcat10-embed-java 10.1.16-1ubuntu0.1~esm4 Available with Ubuntu Pro libtomcat10-java 10.1.16-1ubuntu0.1~esm4 Available with Ubuntu Pro libtomcat9-java 9.0.70-2ubuntu0.1+esm3 Available with Ubuntu Pro tomcat10 10.1.16-1ubuntu0.1~esm4 Available with Ubuntu Pro Ubuntu 22.04 LTS libtomcat9-embed-java 9.0.58-1ubuntu0.2+esm4 Available with Ubuntu Pro libtomcat9-java 9.0.58-1ubuntu0.2+esm4 Available with Ubuntu Pro tomcat9 9.0.58-1ubuntu0.2+esm4 Available with Ubuntu Pro Ubuntu 20.04 LTS libtomcat9-embed-java 9.0.31-1ubuntu0.9+esm3 Available with Ubuntu Pro libtomcat9-java 9.0.31-1ubuntu0.9+esm3 Available with Ubuntu Pro tomcat9 9.0.31-1ubuntu0.9+esm3 Available with Ubuntu Pro Ubuntu 18.04 LTS libtomcat9-embed-java 9.0.16-3ubuntu0.18.04.2+esm8 Available with Ubuntu Pro libtomcat9-java 9.0.16-3ubuntu0.18.04.2+esm8 Available with Ubuntu Pro tomcat9 9.0.16-3ubuntu0.18.04.2+esm8 Available with Ubuntu Pro After a standard system update you need to restart Tomcat to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8417-1

CVE-2026-41284, CVE-2026-41293, CVE-2026-42498, CVE-2026-43512,

CVE-2026-43513, CVE-2026-43515

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8417-1

Topics%20covered

Topics Covered

security advisory DoS Ubuntu tomcat arbitrary execution bypass authentication

Package Information

https://launchpad.net/ubuntu/+source/tomcat10/10.1.40-1ubuntu1.26.04.1 https://launchpad.net/ubuntu/+source/tomcat9/9.0.115-1ubuntu0.1 https://launchpad.net/ubuntu/+source/tomcat10/10.1.40-1ubuntu1.25.10.1 https://launchpad.net/ubuntu/+source/tomcat9/9.0.95-1ubuntu1.1

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