CVE-2026-78437: Incomplete Cleanup

September 23, 2026

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.

This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

References

github.com/apache/tomcat/commit/70579060454a203977b5696ece71e7cbd6ee9bde
lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg
nvd.nist.gov/vuln/detail/CVE-2026-78437

Code Behaviors & Features

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