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Apache Tomcat EUVDEUVD-2026-66127

| CVE-2026-65637 CRITICAL
Improper Input Validation (CWE-20)
2026-08-25 security@apache.org GHSA-f525-44xv-f2qj
Tomcat Apache Information Disclosure Red Hat Suse
Critical
Disputed · 9.8 Vendor: apache
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Severity by source

Sources disagree (Medium–Critical)
Vendor (apache) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Network-reachable, unauthenticated, low-complexity per the input vector, but the vendor 'Information Disclosure' tag and undisclosed impact argue for C:H with I/A set to N pending confirmation.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Red Hat
6.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 26, 2026 - 16:29 vuln.today
CVSS changed
Aug 26, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 25, 2026 - 22:17 cve.org
CRITICAL 9.8
CVE Published
Aug 25, 2026 - 22:17 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

Improper input validation in Apache Tomcat 9.0.115-9.0.120, 10.1.53-10.1.57, and 11.0.20-11.0.24 stems from an incomplete fix for CVE-2026-32990 and, per its CVSS:3.1 vector, permits remote unauthenticated attackers to compromise confidentiality, integrity, and availability of the servlet container. Reported by the Apache security team, it carries a critical 9.8 base score, though vendor tagging labels the impact as Information Disclosure, which is narrower than the vector implies. …

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Vulnerability AssessmentAI

Exploitation The target must run one of the specific vulnerable builds - Apache Tomcat 11.0.20-11.0.24, 10.1.53-10.1.57, or 9.0.115-9.0.120 - and expose the connector handling the vulnerable input path to the attacker over the network. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict and should be weighed carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Apache Tomcat 11.0.25, 10.1.58, or 9.0.121, each of which completes the fix that CVE-2026-32990's remediation left incomplete. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all systems running affected Tomcat versions (9.0.115-9.0.120, 10.1.53-10.1.57, 11.0.20-11.0.24) using asset management tools, prioritizing production environments and external-facing deployments. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-66127 vulnerability details – vuln.today
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