Allocation of Resources Without Limits or Throttling in RabbitMQ C client - #VU164404
Published: November 10, 2026
Vulnerability identifier: #VU164404
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to exhaust client memory and cause a denial of service.
The vulnerability exists due to unchecked resource allocation in the RabbitMQ C client's AMQP frame parser when allocating channel pools before validating channels and frame types, with ignored frames retaining pool pages. A remote attacker can control an AMQP peer or intercept plaintext AMQP traffic and send a sustained stream of small frames with unknown types such as 0xff or channels exceeding the negotiated channel_max to exhaust memory and potentially terminate the client.
Affected software
RabbitMQ C client
Remediation
Install security update from vendor's website.
RabbitMQ C client - update to 0.18.0