CVE-2026-67231
Description
A flaw was found in RabbitMQ. The trust-store plugin incorrectly validates client certificates by only matching the issuer name and serial number, rather than using the full certificate for path validation. This allows a remote attacker, who knows the issuer name and serial number of a whitelisted certificate, to bypass Transport Layer Security (TLS) client authentication by presenting a forged self-signed certificate. This could lead to unauthorized access to the RabbitMQ messaging and streaming broker.
Statement
Important: This flaw in RabbitMQ's trust-store plugin allows a TLS client-authentication bypass. An attacker can connect with a forged self-signed certificate if the rabbitmq_trust_store plugin is enabled and used for TLS verification, and the attacker knows the Issuer DN and serial number of a whitelisted certificate. This bypass could lead to unauthorized access to RabbitMQ resources.
Mitigation
For affected community projects where the `rabbitmq_trust_store` plugin is enabled, disable the plugin if it is not essential for operations. If the plugin is required, ensure that whitelisted certificates are managed securely and their Issuer DN and serial numbers are not publicly exposed or easily guessable.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 9.1 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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