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Message-ID: <2a2f86a3-029e-420c-9f55-b61efb14af76@apache.org>
Date: Wed, 23 Sep 2026 12:28:29 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-79677: Apache Tomcat: WebSocket DoS due to lost asynchronous
write timeout
Severity: moderate
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.25
- Apache Tomcat 10.1.0-M1 through 10.1.59
- Apache Tomcat 9.0.0.M1 through 9.0.121
- Apache Tomcat 8.5.0 through 8.5.100
- Apache Tomcat 7.0.43 through 7.0.109
- Apache Tomcat before 7.0.43 unaffected
Description:
Missing release of resource after effective lifetime, Comparison using
wrong factors vulnerability in Apache Tomcat allows a denial of service
as a result of lost time outs for asynchronous WebSocket writes.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from
10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through
7.0.109. 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/bzwps6ck4szf2hmksbbon3syyl9qnkv8
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-79677
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