What’s Vulnerable › Vulnerabilities

CVE-2026-57212: RabbitMQ management HTTP API accepts request bodies larger than configured max_http_body_size

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-770

Description

RabbitMQ is a messaging and streaming broker. Prior to 3.13.14, 4.0.19, 4.1.10, and 4.2.5, the rabbitmq_management HTTP API accepts oversized valid JSON bodies on with_decode and direct_request paths because read_complete_body checks the accumulated size before the final chunk but not the final combined size. This issue is fixed in versions 3.13.14, 4.0.19, 4.1.10, and 4.2.5.

Affected products

• rabbitmq-server: from 3.13.0 before 4.2.5 — fixed in 4.2.5

How to fix

Upgrade to a fixed version: rabbitmq-server 4.2.5. Check the vendor advisory for mitigations.

References

• https://github.com/rabbitmq/rabbitmq-server/commit/3976d148901bdfa82e1cd60b7a4534e073266ba5
• https://github.com/rabbitmq/rabbitmq-server/commit/b8fc2ef7c50a2797d15e1ea7cf34f290032303bb
• https://github.com/rabbitmq/rabbitmq-server/pull/15712
• https://github.com/rabbitmq/rabbitmq-server/pull/15714
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.5
• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-5cmq-vp28-xqrj
• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-5cmq-vp28-xqrj

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