Improper Input Validation in Apache Tomcat Affects Multiple Versions
CVE-2026-65637

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
25 August 2026

What is CVE-2026-65637?

An improper input validation vulnerability has been identified in Apache Tomcat due to an incomplete fix related to a previous issue. This vulnerability affects multiple versions of Apache Tomcat and can lead to security risks if not addressed. Users are strongly urged to update to the latest versions to mitigate potential threats.

Affected Version(s)

Apache Tomcat 11.0.20 <= 11.0.24

Apache Tomcat 10.1.53 <= 10.1.57

Apache Tomcat 9.0.115 <= 9.0.120

References

https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbms...
vendor-advisory

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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