CVE-2026-67225

RabbitMQ: Stream-protocol frame length never validated against frame_max

HIGH

7.5

CVSS Score

Published: September 25, 2026 at 04:02 PM UTC

Updated: October 20, 2026 at 01:37 PM UTC

2 products affected across 2 vendorsRabbitmq ServerRabbitmq Server

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Severity

HIGH7.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, the stream protocol stored the FrameMax value negotiated during the Tune handshake but did not compare it with an inbound frame's declared length before buffering the frame. With the stream plugin enabled, a remote client could therefore cause excessive memory pressure and denial of service by declaring an oversized frame. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rabbitmq Server · Broadcom

95%

3.13.0 ≤ v < 3.13.154.0.0 ≤ v < 4.0.204.1.0 ≤ v < 4.1.114.2.0 ≤ v < 4.2.6

Rabbitmq Server · Rabbitmq

90%

Affected range stops below 3.13.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.20, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.1.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.2.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-c8c4-gvv4-8j3q

x_refsource_MISCRelease NotesPatch

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-770

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