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CVE-2026-65637: CWE-20 Improper Input Validation in Apache Software Foundation Apache Tomcat

0
Critical
VulnerabilityCVE-2026-65637cvecve-2026-65637cwe-20
Published: 08/25/2026 (08/25/2026, 21:49:13 UTC)
Source: CVE Database V5
Vendor/Project: Apache Software Foundation
Product: Apache Tomcat

Description

CVE-2026-65637 is a critical improper input validation vulnerability in Apache Tomcat. It affects versions 11.0.20 through 11.0.24, 10.1.53 through 10.1.57, and 9.0.115 through 9.0.120. The issue arises from an incomplete fix for a previous vulnerability (CVE-2026-32990). Successful exploitation could lead to full confidentiality, integrity, and availability impact. Users are advised to upgrade to fixed versions 11.0.25, 10.1.58, or 9.0.121.

CVSS v3.1

Score 9.8critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Apache Software Foundation

Apache Tomcat

Affected versions
>=11.0.20 <=11.0.24>=10.1.53 <=10.1.57>=9.0.115 <=9.0.120

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/09/2026, 21:07:09 UTC

Technical Analysis

This vulnerability in Apache Tomcat is due to improper input validation stemming from an incomplete remediation of CVE-2026-32990. It affects multiple recent versions across the 9.0.x, 10.1.x, and 11.0.x branches. The CVSS v3.1 base score is 9.8, indicating critical severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact includes high confidentiality, integrity, and availability loss. The vendor has released fixed versions 11.0.25, 10.1.58, and 9.0.121 to address the issue.

Potential Impact

Exploitation of this vulnerability could allow an unauthenticated attacker to cause complete compromise of the affected Apache Tomcat server, impacting confidentiality, integrity, and availability. This is due to improper input validation that could be leveraged remotely without user interaction or privileges.

Mitigation Recommendations

Users should upgrade affected Apache Tomcat installations to versions 11.0.25, 10.1.58, or 9.0.121, which contain the official fixes for this vulnerability. Patch status is confirmed by the vendor advisory recommending these versions. No other mitigations are specified.

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Technical Details

Data Version
5.2
Assigner Short Name
apache
Date Reserved
2026-07-22T14:38:10.136Z
State
PUBLISHED

Threat ID: 6a8e0eb7acd9273b49c03ed9

Added to database: 08/25/2026, 21:52:55 UTC

Last enriched: 09/09/2026, 21:07:09 UTC

Last updated: 10/10/2026, 18:48:21 UTC

Views: 70

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