RabbitMQ: Atom exhaustion: OAuth2 JWT tag: scope values
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.
CVE-2026-66071
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-66071
rabbitmq-server
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "rabbitmq",
"product": "rabbitmq-server",
"versions": [
{
"status": "affected",
"version": ">= 3.13.0, < 3.13.15"
},
{
"status": "affected",
"version": ">= 4.0.0, < 4.0.22"
},
{
"status": "affected",
"version": ">= 4.1.0, < 4.1.11"
},
{
"status": "affected",
"version": ">= 4.2.0, < 4.2.6"
},
{
"status": "affected",
"version": ">= 4.3.0, < 4.3.1"
}
]
}
]- Related CVEs
- CVE-2026-66071
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #2221 · Revision 1
- Added to Heist Feed
- Publisher date