Resource exhaustion in RabbitMQ Server - #VU137236
Published: July 9, 2026
Vulnerability identifier: #VU137236
CSH Severity: Low
CVSS v4 BT: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in extract_scopes/1 in the OAuth2 authentication backend when processing user-influenced JWT scope values. A remote user can submit signed tokens with novel rabbitmq.tag: scope values to cause a denial of service.
Exploitation requires rabbitmq_auth_backend_oauth2 to be enabled and an IdP configuration that permits user-influenced scope values in signed tokens.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 3.13.15, 4.1.0 alpha, 4.1.11, 4.2.6, 4.3.1