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Message-ID: <9e74ce34-eaae-4cca-97c0-3ca01b393ea4@apache.org>
Date: Wed, 23 Sep 2026 12:21:40 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-77791: Apache Tomcat: DoS via busy wait during WebSocket
close
Severity: important
Affected versions:
- Apache Tomcat 11.0.0-M5 through 11.0.25
- Apache Tomcat 10.1.8 through 10.1.59
- Apache Tomcat 9.0.74 through 9.0.121
- Apache Tomcat 8.5.88 through 8.5.100
- Apache Tomcat through 7.0.109 unaffected
Description:
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during
sending of WebSocket close message enabled a DoS attack.
This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from
10.1.8 through 10.1.59, from 9.0.74 through 9.0.121.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.88 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/mb1pjjooqytrl6hbvbt3rw1lqwlon4cz
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-77791
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