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Message-ID: <0faa9a61-119f-46b8-a83b-d9189899c099@apache.org>
Date: Wed, 23 Sep 2026 12:18:34 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-77756: Apache Tomcat: Transfer-Encoding honored for HTTP/1.0
requests
Severity: low
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.25
- Apache Tomcat 10.1.0-M1 through 10.1.59
- Apache Tomcat 9.0.47 through 9.0.121
- Apache Tomcat 8.5.67 through 8.5.100
- Apache Tomcat through 7.0.109 unaffected
Description:
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response
Smuggling') vulnerability in Apache Tomcat caused by processing the
transfer-encoding header for an HTTP/1.0 request may allow an attacker
to cause one request from another user to fail when Tomcat is located
behind a reverse proxy.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from
10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.67 through 8.5.100. Other unsupported
versions may also be affected.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122,
which fix the issue.
References:
https://lists.apache.org/thread/bl5b6rxqh3vb2k9bj2794vhor7o6xl3z
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-77756
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