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CVE-2026-67416— RabbitMQ: AMQP 1.0 symbolic body descriptor prefix collisions bypass validation

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, the optimized AMQP 1.0 server_mode parser in deps/amqp10_common/src/amqp10_binary_parser.erl matches the textual prefixes of symbolic data, sequence, and value bo

CVSS 5.3 · 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-2026-67416

Vulnerability Information

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Vulnerability Title
RabbitMQ: AMQP 1.0 symbolic body descriptor prefix collisions bypass validation
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, the optimized AMQP 1.0 server_mode parser in deps/amqp10_common/src/amqp10_binary_parser.erl matches the textual prefixes of symbolic data, sequence, and value body descriptors without verifying their encoded symbol lengths. An authenticated AMQP 1.0 publisher with write permission can submit a well-formed unknown descriptor that begins with a registered body descriptor, and RabbitMQ misclassifies and stores the bytes as a standard body section. Strict AMQP 1.0 consumers can terminate while decoding the stored entry. For bodies misclassified as data, AMQP 0-9-1 or other cross-protocol conversion performs full body decoding and can terminate the consumer protocol process, with acknowledgement-required delivery permitting repeated failures. Sequence and value classifications are normally transported as opaque encoded payloads on that conversion path. The broker remains alive, and the issue does not bypass routing or authorization. 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:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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-2026-67416

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III. Intelligence Information for CVE-2026-67416

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Other References for CVE-2026-67416 (6)

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

CVE-2026-67414 6.0 MEDIUM RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggrega
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-20

V. Comments for CVE-2026-67416

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