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Apache Tomcat CVE-2026-65183

| EUVDEUVD-2026-66125 HIGH
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-08-25 security@apache.org GHSA-h3mr-2w3q-jcv9
Tomcat Apache Information Disclosure Red Hat Suse
8.1
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
8.1 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Unix domain sockets are local-only IPC; 'local user' requirement mandates AV:L and PR:L; race condition timing dependency requires AC:H.

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

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
High
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
8.1 (HIGH)
CVE Published
Aug 25, 2026 - 22:17 cve.org
HIGH 8.1
CVE Published
Aug 25, 2026 - 22:17 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain sockets allows an unauthorised local user to access the unix domain socket.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.42 through 9.0.120.

Users are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.

AnalysisAI

Apache Tomcat's Unix domain socket creation path exposes a TOCTOU race condition across versions 9.0.42-9.0.120, 10.1.0-M1-10.1.57, and 11.0.0-M1-11.0.24, enabling an unauthorized local OS user to seize the socket before Tomcat finalizes access permissions. The vendor-assigned CVSS 8.1 with AV:N directly conflicts with the description's explicit 'local user' constraint and the inherently host-local nature of Unix domain sockets - the effective attack surface is limited to users with OS-level access on Tomcat hosts. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Exploit
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Vulnerability AssessmentAI

Exploitation Exploitation requires all three of the following: (1) local OS access - the attacker must hold a shell or code execution on the same host running the Tomcat instance; (2) Tomcat must be actively configured to create and use Unix domain sockets - deployments that do not use this connector type are not exposed to this code path; (3) the attacker must win a timing race during socket creation, which is non-deterministic and may require repeated attempts. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-provided CVSS 3.1 vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H presents a material conflict: the description explicitly states 'unauthorised local user' and the mechanism involves Unix domain socket files, which are local IPC constructs - not network-reachable. … 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 patches are available: upgrade to Apache Tomcat 11.0.25, 10.1.58, or 9.0.121 depending on your active branch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit your environment to identify Tomcat instances in the affected version ranges (9.0.42-9.0.120, 10.1.0-M1-10.1.57, 11.0.0-M1-11.0.24) and determine which systems permit untrusted or semi-trusted local OS users with shell access. …

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Vendor StatusVendor

SUSE

Severity: Moderate
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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CVE-2026-65183 vulnerability details – vuln.today
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