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9.8

CVE-2026-41293: Apache Tomcat allows unauthorized access due to input mistakes

CVE-2026-41293 BIT-tomcat-2026-41293 GHSA-r29c-68gh-xp6x
Summary

Apache Tomcat versions from 9 to 11 have a security flaw that could let attackers access data they shouldn't. This matters because it could expose sensitive information. To fix it, update to the latest version of Apache Tomcat.

What to do
  • Update tomcat to version 9.0.118.
  • Update org.apache.tomcat.embed:tomcat-embed-core to version 9.0.118.
  • Update org.apache.tomcat.embed:tomcat-embed-core to version 10.1.55.
  • Update org.apache.tomcat.embed:tomcat-embed-core to version 11.0.22.
  • Update org.apache.tomcat:tomcat to version 9.0.118.
  • Update org.apache.tomcat:tomcat to version 10.1.55.
  • Update org.apache.tomcat:tomcat to version 11.0.22.
  • Update org.apache.tomcat:tomcat-catalina to version 9.0.118.
  • Update org.apache.tomcat:tomcat-catalina to version 10.1.55.
  • Update org.apache.tomcat:tomcat-catalina to version 11.0.22.
Affected software
Ecosystem VendorProductAffected versions
Bitnami – tomcat >= 9.0.0.M1, < 9.0.118
Fix: upgrade to 9.0.118
– apache tomcat >= 8.5.0, <= 8.5.100
>= 9.0.0, < 9.0.118
>= 10.0.0, <= 10.0.27
>= 10.1.0, < 10.1.55
>= 11.0.0, < 11.0.22
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
maven – org.apache.tomcat.embed:tomcat-embed-core < 9.0.118
>= 10.1.0-M1, < 10.1.55
>= 11.0.0-M1, < 11.0.22
Fix: upgrade to 9.0.118
maven – org.apache.tomcat:tomcat < 9.0.118
>= 10.1.0-M1, < 10.1.55
>= 11.0.0-M1, < 11.0.22
Fix: upgrade to 9.0.118
maven – org.apache.tomcat:tomcat-catalina < 9.0.118
>= 10.1.0-M1, < 10.1.55
>= 11.0.0-M1, < 11.0.22
Fix: upgrade to 9.0.118
Original title
Apache Tomcat - HTTP/2 request headers not validated
Original description
Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.21
Apache Tomcat 10.1.0-M1 to 10.1.54
Apache Tomcat 9.0.0.M1 to 9.0.117
Older, unsupported versions may also be affected

Description:
HTTP/2 request headers were not validated which may have triggered
unexpected application behaviour if the application (quite reasonably)
assumed that header value exposed through the Servlet API would be
specification compliant.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.22 or later
- Upgrade to Apache Tomcat 10.1.55 or later
- Upgrade to Apache Tomcat 9.0.118 or later

Credit:
This issue was identified by Dawit Jeong (@dawitngoliath)
Vulnerability type
CWE-20 Improper Input Validation
Published: 12 May 2026 · Updated: 28 May 2026 · First seen: 12 May 2026