High severity · published Jul 10, 2026
CVE-2026-57220
RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
rabbitmq-server · rabbitmq
>= 4.2.0, < 4.2.6 · source: vendor
RS
Rabbitmq Server · Broadcom
4.2.0 before 4.2.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57220
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57220
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad963547
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825679e
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/16171
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/16173
Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
Exploit
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q
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