CVE-2026-65637

Analyzed Analyzed - Analysis Complete

Improper Input Validation in Apache Tomcat

Publication date: 2026-08-25

Last updated on: 2026-08-27

Assigner: Apache Software Foundation

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-25

Last Modified

2026-08-27

Generated

2026-09-15

AI Q&A

2026-08-26

EPSS Evaluated

2026-09-13

NVD

CVE-2026-65637

EUVD

EUVD-2026-66127

Affected Vendors & Products

Vendor	Product	Version / Range
apache	tomcat	From 10.1.53 (inc) to 10.1.58 (exc)
apache	tomcat	From 11.0.20 (inc) to 11.0.25 (exc)
apache	tomcat	From 9.0.115 (inc) to 9.0.121 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	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.

Attack-Flow Graph

Executive Summary

This is an Improper Input Validation vulnerability in Apache Tomcat caused by an incomplete fix for CVE-2026-32990. It affects multiple versions of Tomcat between specific ranges.

Detection Guidance

This vulnerability is related to improper input validation in Apache Tomcat versions between 11.0.20-11.0.24, 10.1.53-10.1.57, and 9.0.115-9.0.120. Detection involves checking the installed Tomcat version and comparing it against affected ranges.

Impact Analysis

The vulnerability could allow attackers to manipulate input data in ways that Tomcat does not properly validate, potentially leading to unexpected behavior or security breaches in affected systems.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. The vulnerability involves improper input validation in Apache Tomcat, which could potentially lead to security risks such as unauthorized access or data breaches. However, without explicit details on data exposure or processing, its direct compliance impact remains unclear.

Mitigation Strategies

Upgrade Apache Tomcat to version 11.0.25, 10.1.58, or 9.0.121 or later to address the improper input validation issue.

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