CVE-2026-67416 rabbitmq CVE debrief

Who should care

RabbitMQ administrators and users, particularly those with AMQP 1.0 publishers and strict consumers, should assess exposure and prioritize updates to fixed versions. This includes reviewing system configurations, verifying RabbitMQ versions, and monitoring for unusual consumer behavior. Security teams should also consider compensating controls for exposed systems and track exceptions during remediation.

Why it matters

Defenders should care about this vulnerability as it can cause consumer protocol process terminations, potentially leading to repeated failures and requiring verification of RabbitMQ versions and inventory checks.

• Potential termination of strict AMQP 1.0 consumer protocol processes
• Possible repeated failures with acknowledgement-required delivery
• Need for verification of RabbitMQ versions and inventory checks

Technical summary

The optimized AMQP 1.0 server_mode parser in RabbitMQ has a vulnerability that allows an authenticated publisher to submit a well-formed unknown descriptor that begins with a registered body descriptor. This can cause strict AMQP 1.0 consumers to terminate while decoding the stored entry. The issue arises from the parser matching textual prefixes of symbolic data, sequence, and value body descriptors without verifying their encoded symbol lengths. Affected versions include RabbitMQ 4.0.0 through 4.0.23, 4.1.0 through 4.1.14, 4.2.0 through 4.2.9, and 4.3.0 through 4.3.3, with fixes in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.

Defensive priority

Defenders should prioritize updating RabbitMQ to a fixed version (4.0.24, 4.1.15, 4.2.10, or 4.3.4) to prevent potential consumer protocol process terminations. Inventory checks and monitoring for unusual consumer behavior are also recommended.

Recommended defensive actions

• Update RabbitMQ to version 4.0.24, 4.1.15, 4.2.10, or 4.3.4
• Inventory and verify RabbitMQ versions in use
• Monitor for unusual consumer protocol process behavior
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including affected versions (RabbitMQ 4.0.0 through 4.0.23, 4.1.0 through 4.1.14, 4.2.0 through 4.2.9, and 4.3.0 through 4.3.3) and fixed versions (4.0.24, 4.1.15, 4.2.10, and 4.3.4). However, there is limited information on potential exploitation or victim impact. Defenders should verify RabbitMQ versions in use and review system logs for unusual activity. The vulnerability allows an authenticated AMQP 1.0 publisher to submit a well-formed unknown descriptor that is

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.