Resource exhaustion in Broadcom Rabbitmq Server
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (44.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.005 · change: -0.004
Affected products
- Broadcom Rabbitmq Server
- Rabbitmq Rabbitmq-Server — versions >= 4.2.0, < 4.2.6
Weakness classification (CWE)
References
- github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q (Exploit, Vendor Advisory)
- github.com/rabbitmq/rabbitmq-server/pull/16171 (Patch, Issue Tracking)
- github.com/rabbitmq/rabbitmq-server/pull/16173 (Patch, Issue Tracking)
- github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad96… (Patch)
- github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825… (Patch)
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 (Release Notes)
Frequently asked questions
- What is CVE-2026-57220?
- CVE-2026-57220 is a high-severity vulnerability in Broadcom Rabbitmq Server, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-07-10.
- How severe is CVE-2026-57220?
- High severity. CVSS v3 base score is 7.5 out of 10.