CVE-2026-66080
mediumRabbitMQ is a messaging and streaming broker.
Vendor / product: Broadcom — rabbitmq server
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.
CVSS
4.9
4.9 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-23 21:16
Modified: 2026-10-19 20:37
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 06:55 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
broadcom / rabbitmq_server ≥4.1.0 <4.1.11, ≥4.2.0 <4.2.6
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 security-advisories@github.com
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0 security-advisories@github.com
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:55 UTC · record ↗