CVE-2026-88041

Apache Tomcat: HTTP/2 trailer header cross-contamination

Published Oct 20, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.



This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.



Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Low

Type Values Removed Values Added
First Time appeared Apache
Apache apache Tomcat
Apache tomcat
Apache Software Foundation
Apache Software Foundation tomcat
Vendors & Products Apache
Apache apache Tomcat
Apache tomcat
Apache Software Foundation
Apache Software Foundation tomcat
Type Values Removed Values Added
Description Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request. This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.
Title Apache Tomcat: HTTP/2 trailer header cross-contamination
Weaknesses CWE-459
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Oct 29, 2026, 5:54 PM
Reserved
Sep 9, 2026, 8:29 PM
Status
Deferred
Published
Oct 20, 2026, 2:17 PM
Modified
Oct 29, 2026, 6:17 PM
Severity
Low
Public date
Oct 20, 2026, 1:43 PM