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Message-ID: <ca9e1874-a6a3-40a2-9231-fede32a905b6@apache.org>
Date: Tue, 25 Aug 2026 23:01:11 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2
backlog tracking when a stream is reset
Severity: important
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.24
- Apache Tomcat 10.1.0-M1 through 10.1.57
- Apache Tomcat 9.0.39 through 9.0.120
- Apache Tomcat 8.5.59 through 8.5.100
- Apache Tomcat through 7.0.109 unaffected
Description:
Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an
allocation leak in the HTTP/2 backlog tracking when a stream is reset
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from
10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.59 through 8.5.100. Other unsupported
versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121,
which fix the issue.
Credit:
Zhen Kong (finder)
References:
https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-68763
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