CVE-2026-86350 PUBLISHED

Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up

Assigner: apache
Reserved: 07.09.2026 Published: 23.09.2026 Updated: 23.09.2026

Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up.

This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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.

Product Status

Vendor Apache Software Foundation
Product Apache Tomcat
Versions Default: unaffected
  • affected from 11.0.22 to 11.0.25 (incl.)
  • affected from 10.1.55 to 10.1.59 (incl.)
  • affected from 9.0.118 to 9.0.121 (incl.)

Credits

  • Jeppe Weikop finder

References

Problem Types

  • CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') CWE