CVE-2026-57220: rabbitmq server DoS — Exploit & Fix

Description

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0052

Probability of exploitation

0.41%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
broadcom	rabbitmq_server	< 4.2.6

References

Advisories & Patches

https://github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad963547 https://github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825679e https://github.com/rabbitmq/rabbitmq-server/pull/16171 https://github.com/rabbitmq/rabbitmq-server/pull/16173 https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q

Exploits

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q

Other References

https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6

Frequently Asked Questions

What is CVE-2026-57220? +

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-57220? +

CVE-2026-57220 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0052, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57220? +

CVE-2026-57220 affects products from broadcom, specifically: rabbitmq_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-57220? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-57220