Improper Validation of Unsafe Equivalence in Input Affecting tomcat9-jsp-2.3-api package, versions <1:9.0.115-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-AMZN2023-TOMCAT9JSP23API-15850057
  • published30 Mar 2026
  • disclosed17 Feb 2026

Introduced: 17 Feb 2026

CVE-2025-66614  (opens in a new tab)
CWE-1289  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 tomcat9-jsp-2.3-api to version 1:9.0.115-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-1496.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tomcat9-jsp-2.3-api package and not the tomcat9-jsp-2.3-api package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Improper Input Validation vulnerability.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112.

The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field.

The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application.

Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.

CVSS Base Scores

version 3.1