CVE-2026-43514: Apache Tomcat: AJP secret compared in non-constant time

Severity: low (CVSS 3.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-12 · updated 2026-10-26
Weakness: CWE-208

Description

Observable Timing Discrepancy vulnerability when comparing AJP secret in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Affected products

Apache Tomcat: from 7.0.0 through 7.0.109; from 8.5.0 through 8.5.100; from 9.0.0 before 9.0.118; from 10.1.0 before 10.1.55; from 11.0.0 before 11.0.22 — fixed in 9.0.118, 10.1.55, 11.0.22

How to fix

Upgrade to a fixed version: Apache Tomcat 9.0.118, 10.1.55, 11.0.22. Check the vendor advisory for mitigations.

References

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