# CVE-2026-66079

Unauthenticated AMQP1.0 frame triggers RabbitMQ node crash (remote DoS)

- Page: https://www.vulneraibility.com/cve/CVE-2026-66079
- CVSS: 8.2
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.32% (percentile 24.9)
- CISA SSVC: exploitation none, automatable yes, technical impact partial (assessed 2026-09-29)
- Weakness: CWE-770
- Also known as: GHSA-c66h-hf5j-8jf9
- Published: 2026-09-23

## Affected versions

- rabbitmq: affected >= 3.13.0 and < 3.13.15; >= 4.0.0 and < 4.0.20; >= 4.1.0 and < 4.1.11; >= 4.2.0 and < 4.2.6; fixed in 3.13.15, 4.0.20, 4.1.11, 4.2.6 (Bitnami advisory, via OSV)
- rabbitmq rabbitmq-server: affected >= 3.13.0 and < 3.13.15; >= 4.0.0 and < 4.0.20; >= 4.1.0 and < 4.1.11; >= 4.2.0 and < 4.2.6

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated remote DoS: a single ~19-byte AMQP 1.0 frame exhausts Erlang VM heap, crashes node and disrupts all tenants/protocols.

## Action

Immediate action required

## Recommendation

Upgrade to fixed versions; block/disable AMQP1.0 (port 5672) until patched.

## References

- [other] https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-c66h-hf5j-8jf9
- [other] https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.