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Description

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-09 | Updated 2026-04-10 | Assigner apache

Problem types

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled

Product status

Default status
unaffected

11.0.0-M14 (semver)
affected

10.1.22 (semver)
affected

9.0.92 (semver)
affected

Credits

Haruki Oyama (Waseda University) finder

References

www.openwall.com/lists/oss-security/2026/04/09/29

lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2 vendor-advisory

cve.org (CVE-2026-34500)

nvd.nist.gov (CVE-2026-34500)

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