HTTP Request Smuggling Affecting tomcat11-servlet-6.1-api package, versions <1:11.0.26-1.amzn2023.0.1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.31% (22nd percentile)

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  • Snyk IDSNYK-AMZN2023-TOMCAT11SERVLET61API-20848977
  • published13 Oct 2026
  • disclosed23 Sept 2026

Introduced: 23 Sep 2026

NewCVE-2026-86350  (opens in a new tab)
CWE-444  (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.

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.

CVSS Base Scores

version 3.1