CVE-2026-65637: Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete

[Mark Thomas <markt () apache org>]

Severity: moderate

Affected versions:

- Apache Tomcat 11.0.20 through 11.0.24
- Apache Tomcat 10.1.53 through 10.1.57
- Apache Tomcat 9.0.115 through 9.0.120

Description:

Improper Input Validation vulnerability in Apache Tomcat due to 
incomplete fix for CVE-2026-32990.



This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 
10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.



Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, 
which fix the issue.

Credit:

Parag Ambildhuke (https://github.com/paragxa) (finder)

References:

https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-65637