Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.



This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.



Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Advisories

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Fixes

Solution

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Workaround

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History

Wed, 23 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache apache Tomcat
Vendors & Products Apache
Apache apache Tomcat

Wed, 23 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
Description Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Title Apache Tomcat: HTTP/2 DoS via malformed request
Weaknesses CWE-459
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-09-23T16:25:54.815Z

Reserved: 2026-08-24T16:10:49.885Z

Link: CVE-2026-78437

cve-icon Vulnrichment

Updated: 2026-09-23T16:25:28.259Z

cve-icon NVD

Status : Received

Published: 2026-09-23T12:17:07.340

Modified: 2026-09-23T17:17:17.023

Link: CVE-2026-78437

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T13:45:04Z

Weaknesses