Apache Tomcat Improper Input Validation (before 11.0.25/10.1.58/9.0.121)
CVE-2026-65637 Published on August 25, 2026
Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete
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.
Vulnerability Analysis
CVE-2026-65637 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-65637
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.20, <= 11.0.24 is affected.
- Version 10.1.53, <= 10.1.57 is affected.
- Version 9.0.115, <= 9.0.120 is affected.