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TI-2026-74164 Aliases CVE-2026-67414

RabbitMQ AMQP parser flaw lets clients exhaust broker memory

Priority MEDIUM 60CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

RabbitMQ server versions from 4.0.0 before 4.0.24, from 4.1.0 before 4.1.15, from 4.2.0 before 4.2.10 and from 4.3.0 before 4.3.4 are affected. The AMQP 1.0 parser expands every element of zero-width arrays and limits only the element count per array, not the total across a frame (CWE-770). After SASL authentication, a low-privilege client can send a small frame that exhausts broker memory, and repeated frames can trigger the node-wide memory alarm and block publishers.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.24, 4.1.15, 4.2.10, and 4.3.4, deps/amqp10_common/src/amqp10_binary_parser.erl materializes each element of AMQP 1.0 arrays whose shared constructor has zero width, while limiting only the number of elements in each array and not the aggregate arrays in a frame. After completing SASL authentication, a low-privilege client can send an ordinary frame containing many individually permitted arrays, causing a small frame to expand into a very large reader-process heap before later frame validation or authorization. Because deps/rabbit/src/rabbit_amqp_reader.erl clears the pre-authentication max_heap_size guard after login, repeated or concurrent frames can trigger the node-wide memory alarm, block publishers, or exhaust broker memory. This issue is fixed in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00631 50th percentileScored 2026-11-07
Fix Partial rabbitmq-server (rabbitmq): 4.0.24, 4.1.15, 4.2.10 +1Red Hat: 1 advisoryRed Hat: 1 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
rabbitmqrabbitmq-server4.0.0 to before 4.0.24; 4.1.0 to before 4.1.15; 4.2.0 to before 4.2.10; 4.3.0 to before 4.3.44.0.24, 4.1.15, 4.2.10, 4.3.4Patch availableCNA
  • rabbitmq-server Vendorrabbitmq Affected 4.0.0 to before 4.0.24; 4.1.0 to before 4.1.15; 4.2.0 to before 4.2.10; 4.3.0 to before 4.3.4 Fixed in 4.0.24, 4.1.15, 4.2.10, 4.3.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*——Broadcom
  • cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* Versions — — ·Broadcom

Remediation

Upgrade rabbitmq-server to 4.0.24, 4.1.15, 4.2.10 or 4.3.4 for the matching release line. Red Hat Hardened Images are fixed by RHSA-2026:82703. Red Hat OpenStack Platform 13 (Queens), 16.2 and 17.1 have no fix planned, and Red Hat OpenStack Platform 18.0 has no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA rabbitmq-server (rabbitmq) Fixed in 4.0.24, 4.1.15, 4.2.10, 4.3.4

Red Hat 1 advisory

  • RHSA-2026:82703 Released 2026-10-14 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images rabbitmq-server4.3-4.3.6-1.1.hum1@aarch64, rabbitmq-server4.3-4.3.6-1.1.hum1@s390x, rabbitmq-server4.3-4.3.6-1.1.hum1@src +1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 16.2AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 17.1AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 18.0AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:82703

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-67414
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-18 Fix available: RHSA-2026:82703 · Red Hat
  4. 2026-10-18 Fix available: Red Hat Hardened Images · Red Hat
  5. 2026-10-18 CVSS score added · Red Hat
  6. 2026-10-29 CISA SSVC decision points changed
  7. 2026-10-29 Priority changed: LOW → MEDIUM
  8. 2026-10-30 EPSS moved to the 50th–90th percentile

References

Other 3

  • TI-2026-41154 Improper authentication in rabbitmq-server CVSS 3.1CRITICAL 10.0
  • TI-2026-41149 RabbitMQ: UNC SSRF affecting the management UI on Windows CVSS 3.1CRITICAL 10.0
  • TI-2026-41158 Resource allocation without limits in rabbitmq-server CVSS 3.1HIGH 7.5
  • TI-2026-47695 RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint CVSS 4.0HIGH 8.2
  • TI-2026-47694 RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS CVSS 4.0HIGH 8.2
  • TI-2026-45167 RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading CVSS 4.0HIGH 7.5
See all 100 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences