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CVE-2026-67414— RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation

Quick assessment

Affected
rabbitmq rabbitmq-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 numb

CVSS 6.0 · Medium

Affected Version Matrix 4

VendorProduct Version RangeStatus
rabbitmq rabbitmq-server >= 4.0.0, < 4.0.24 affected
>= 4.1.0, < 4.1.15 affected
>= 4.2.0, < 4.2.10 affected
>= 4.3.0, < 4.3.4 affected
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I. Basic Information for CVE-2026-67414

Vulnerability Information

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Vulnerability Title
RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-server >= 4.0.0, < 4.0.24 -

II. Public POCs for CVE-2026-67414

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III. Intelligence Information for CVE-2026-67414

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Patches & Fixes for CVE-2026-67414 (1)

Other References for CVE-2026-67414 (2)

Same Patch Batch · rabbitmq · 2026-10-14 · 3 CVEs total

CVE-2026-67416 5.3 MEDIUM RabbitMQ: AMQP 1.0 symbolic body descriptor prefix collisions bypass validation
CVE-2026-67418 5.3 MEDIUM RabbitMQ MQTT 5: inapplicable PUBLISH property disconnects matching subscribers

IV. Related Vulnerabilities

Same product: rabbitmq-server
Same vendor: rabbitmq
Same weakness: CWE-400

V. Comments for CVE-2026-67414

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