CVE-2026-68763

Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

Published: Aug 25, 2026Updated: Aug 27, 2026 Sources: CVE List NVDCWE-400

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-400

Affected Products

Apache Software Foundation

oss-project·USaka apache foundation

Apache TomcatOn-premWeb App

Networking Infrastructure / load-balancer-proxy

apache

oss-project·USaka apache httpd, apache http server

tomcatOn-premWeb App

Networking Infrastructure / load-balancer-proxy

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl

lists.apache.org

http://www.openwall.com/lists/oss-security/2026/08/26/9

openwall.com

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