RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5 Authentication infinite loop

Summaryinfo

A vulnerability was found in RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5. It has been rated as problematic. Affected is an unknown function of the component Authentication Handler. This manipulation causes infinite loop. The identification of this vulnerability is CVE-2026-57216. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5. It has been declared as problematic. Affected by this vulnerability is an unknown function of the component Authentication Handler. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect confidentiality. The summary by CVE is:

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-57216 since 06/24/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 3.13.15, 4.0.20, 4.1.11 or 4.2.6 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• RabbitMQ

Version

• 3.13.0
• 3.13.1
• 3.13.2
• 3.13.3
• 3.13.4
• 3.13.5
• 3.13.6
• 3.13.7
• 3.13.8
• 3.13.9
• 3.13.10
• 3.13.11
• 3.13.12
• 3.13.13
• 3.13.14
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10
• 4.0.11
• 4.0.12
• 4.0.13
• 4.0.14
• 4.0.15
• 4.0.16
• 4.0.17
• 4.0.18
• 4.0.19
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5

CPE 2.3info

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CPE 2.2info

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