Incorrect Implementation of Authentication Algorithm Affecting tomcat11-servlet-6.1-api package, versions <1:11.0.26-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.39% (30th percentile)

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  • Snyk IDSNYK-AMZN2023-TOMCAT11SERVLET61API-20849888
  • published13 Oct 2026
  • disclosed23 Sept 2026

Introduced: 23 Sep 2026

NewCVE-2026-86248  (opens in a new tab)
CWE-303  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 tomcat11-servlet-6.1-api to version 1:11.0.26-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-3151.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tomcat11-servlet-6.1-api package and not the tomcat11-servlet-6.1-api package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 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.

CVSS Base Scores

version 3.1