CVE-2026-66071

Summary

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.

Affected Software

VendorProductVersion RangeStatus
rabbitmqrabbitmq-server>= 3.13.0, < 3.13.15affected
rabbitmqrabbitmq-server>= 4.0.0, < 4.0.22affected
rabbitmqrabbitmq-server>= 4.1.0, < 4.1.11affected
rabbitmqrabbitmq-server>= 4.2.0, < 4.2.6affected
rabbitmqrabbitmq-server>= 4.3.0, < 4.3.1affected

Weaknesses

  • CWE-400: CWE-400: Uncontrolled Resource Consumption

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References