Description
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1, Atom exhaustion: OAuth2 JWT tag: scope values. extractscopes/1 parses scopes of the form .tag: and calls rabbitdatacoercion:toatom() to convert to a tag atom. The token signature is verified first, so the attacker cannot forge scopes , but in IdP configurations where scope content is user-influenced, each login with a novel tag value leaks one In deployments where users can influence the scopes included in their IdP-issued JWT rabbitmqauthbackendoauth2 enabled IdP permits attacker-influenced scope values in signed tokens. This issue is fixed in versions 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1.
Metrics
CVSS 3.1 6.5/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| rabbitmq | rabbitmq-server | >= 3.13.0, < 3.13.15; >= 4.0.0, < 4.0.22; >= 4.1.0, < 4.1.11; >= 4.2.0, < 4.2.6; >= 4.3.0, < 4.3.1 |
References
- https://github.com/rabbitmq/rabbitmq-server/commit/9a44124d9c932d6fc7d2a3b945e5a143e547bcb6Patch
- https://github.com/rabbitmq/rabbitmq-server/commit/c5690583a53789a3bf00cca508b43e8246db0d11Patch
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6Release Notes
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1Release Notes
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-89p2-f5cv-x5cgExploit, Third Party Advisory
Timeline
- Published
- Sep 25, 2026
- Last modified
- Oct 15, 2026
- NVD status
- Analyzed