CVE-2026-41293: Apache Tomcat: HTTP/2 request headers not validated

Published May 12, 2026
·
Updated

Improper Input Validation vulnerability in Apache Tomcat.

Affected Software

10 affected componentsFixes available
Apache Tomcat>=11.0.0-M1<=11.0.21, >=10.1.0-M1<=10.1.54, >=9.0.0.M1<=9.0.117, >=10.0.0-M1<=10.0.27
Apache Tomcat>=8.5.0<=8.5.100
Apache Tomcat>=9.0.0<9.0.118
Apache Tomcat>=10.0.0<=10.0.27
Apache Tomcat>=10.1.0<10.1.55
Apache Tomcat>=11.0.0<11.0.22
debian/tomcat10<=10.1.52-1~deb12u1, <=10.1.52-1~deb13u1
10.1.55-1~deb12u110.1.55-1~deb13u110.1.55-1
debian/tomcat11<=11.0.15-1~deb13u1
11.0.22-1~deb13u111.0.22-2
debian/tomcat9<=9.0.43-2~deb11u10
9.0.118-0+deb11u19.0.70-29.0.95-19.0.118-1
IBM API Connect V12 OnPrem<=All

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/tomcat10 to a version that resolves this vulnerability.

    Fixed in 10.1.55-1~deb12u1Fixed in 10.1.55-1~deb13u1Fixed in 10.1.55-1
  2. Upgrade

    Upgrade debian/tomcat11 to a version that resolves this vulnerability.

    Fixed in 11.0.22-1~deb13u1Fixed in 11.0.22-2
  3. Upgrade

    Upgrade debian/tomcat9 to a version that resolves this vulnerability.

    Fixed in 9.0.118-0+deb11u1Fixed in 9.0.70-2Fixed in 9.0.95-1Fixed in 9.0.118-1

Event History

May 12, 2026
CVE Published
via MITRE·03:19 PM
Data Sourced
via MITRE·03:19 PM
DescriptionWeakness
Data Sourced
via Red Hat·04:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Jun 10, 2026
Data Sourced
via Launchpad·10:10 AM
Description
Jun 20, 2026
Data Sourced
via Ubuntu·05:48 PM
RemedyDescriptionSeverityAffected Software
Data Sourced
via Debian·05:49 PM
DescriptionAffected Software
Jul 7, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-41293?

CVE-2026-41293 is rated as a medium severity vulnerability due to improper input validation in Apache Tomcat's HTTP/2 request headers.

2

How do I fix CVE-2026-41293?

To fix CVE-2026-41293, update your Apache Tomcat instance to a version that is not affected, specifically to versions 11.0.22 or later, 10.1.55 or later, 9.0.118 or later, or 10.0.28 or later.

3

Which versions of Apache Tomcat are affected by CVE-2026-41293?

CVE-2026-41293 affects Apache Tomcat versions from 11.0.0-M1 to 11.0.21, 10.1.0-M1 to 10.1.54, 9.0.0.M1 to 9.0.117, and 10.0.0-M1 to 10.0.27.

4

What are the potential impacts of CVE-2026-41293?

If exploited, CVE-2026-41293 could allow an attacker to manipulate HTTP/2 request headers, potentially leading to unauthorized access or service disruption.

5

Is there a workaround for CVE-2026-41293 until I can update?

There are no official workarounds for CVE-2026-41293; it is recommended to apply the update as soon as possible.

Company

Resources

Contact

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