CVE-2026-66071
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.
How to fix
- broadcom rabbitmq_server3.13.15, 4.0.22, 4.1.11, 4.2.6, 4.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| broadcom rabbitmq_server | 3.13.0 ≤ v < 3.13.15, 4.0.0 ≤ v < 4.0.22, 4.1.0 ≤ v < 4.1.11, 4.2.0 ≤ v < 4.2.6, 4.3.0 ≤ v < 4.3.1 | 3.13.15, 4.0.22, 4.1.11, 4.2.6, 4.3.1 |
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