RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS

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Summary

CVECVE-2026-57220
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 21:16:59 UTC
Updated2026-07-10 21:16:59 UTC
DescriptionRabbitMQ 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rabbitmq Rabbitmq-server affected >= 4.2.0, < 4.2.6 Not specified

References

ReferenceSourceLinkTags
github.com/rabbitmq/rabbitmq-server/pull/16171 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e046... [email protected] github.com
github.com/rabbitmq/rabbitmq-server/pull/16173 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35q [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c3... [email protected] github.com
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