CVE-2026-79677

Apache Tomcat: WebSocket DoS due to lost asynchronous write timeout

State: Published
Severity: 7.5 High
Published: Sep 23, 2026
Updated: Sep 23, 2026
Reserved: Aug 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-772 Missing release of resource after effective lifetime
CWE-1025 Comparison using wrong factors

Affected Products

Product	Versions
Apache TomcatApache Software Foundation	11.0.0-M1 through 11.0.25Affected 10.1.0-M1 through 10.1.59Affected 9.0.0.M1 through 9.0.121Affected 8.5.0 through 8.5.100Affected 7.0.43 through 7.0.109Affected before 7.0.43Not affected

References

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