CVE-2026-67404

Received Received - Intake

JWT Forgery via MITM in RabbitMQ

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: GitHub, Inc.

Description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, When no CA bundle is available, ssl_options/1 falls back to [{verify, verify_none}] with no warning. An attacker in a man-in-the-middle position can forge the JWKS response, which leads the broker to accept arbitrary JWTs. Preconditions include The OAuth2 plugin must be in use with no cacertfile configured and the OS CA bundle empty or unreadable (for example, in a minimal container), and the attacker must hold a network man-in-the-middle position.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-23

Last Modified

2026-09-23

Generated

2026-09-24

AI Q&A

2026-09-24

EPSS Evaluated

N/A

NVD

CVE-2026-67404

EUVD

EUVD-2026-85631

Affected Vendors & Products

Vendor	Product	Version / Range
rabbitmq	rabbitmq	to 4.3.0 (exc)
rabbitmq	rabbitmq	to 3.13.15 (inc)
rabbitmq	rabbitmq	to 4.0.20 (inc)
rabbitmq	rabbitmq	to 4.1.11 (inc)
rabbitmq	rabbitmq	to 4.2.6 (inc)
rabbitmq	rabbitmq	to 4.3.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-295	The product does not validate, or incorrectly validates, a certificate.

Attack-Flow Graph

Executive Summary

RabbitMQ is a messaging broker with a vulnerability in its OAuth2 plugin. When no CA bundle is configured, it defaults to insecure SSL verification, allowing man-in-the-middle attackers to forge JWKS responses and inject arbitrary JWTs.

Impact Analysis

An attacker could impersonate legitimate users or services, gain unauthorized access to messages, or manipulate data. This requires the OAuth2 plugin to be enabled, no CA certificate configured, and a network position allowing interception.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating confidentiality and integrity requirements in GDPR and HIPAA. Compliance may be compromised if exploited.

Mitigation Strategies

Upgrade RabbitMQ to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, or 4.3.0 or later to address the vulnerability. Ensure the OAuth2 plugin is not in use or configure a valid cacertfile if it is required.

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