CVE-2026-41293

Apache Tomcat: HTTP/2 request headers not validated

Published May 12, 2026 CVSS 3.1 · 9.8 Critical EPSS 1.7% KEV · Not listed
Description
Improper Input Validation vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27.
Older, end of support versions may also be affected.

Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4619-1 tomcat9 security update
Debian DSA Debian DSA DSA-6328-1 tomcat10 security update
Debian DSA Debian DSA DSA-6329-1 tomcat11 security update
Github GHSA Github GHSA GHSA-r29c-68gh-xp6x Apache Tomcat - HTTP/2 request headers not validated
Ubuntu USN Ubuntu USN USN-8417-1 Tomcat vulnerabilities
Ubuntu USN Ubuntu USN USN-8450-1 Tomcat vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
CPEs cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
First Time appeared Apache
Apache tomcat
Vendors & Products Apache
Apache tomcat
Type Values Removed Values Added
Description Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also be affected. Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.
Title Apache Tomcat: HTTP/2 request headers not validated
Weaknesses CWE-20
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Sep 17, 2026, 6:37 PM
Reserved
Apr 20, 2026, 10:26 AM
Status
Analyzed
Published
May 12, 2026, 4:16 PM
Modified
Oct 26, 2026, 6:10 PM
Severity
Moderate
Public date
May 12, 2026, 3:19 PM