---
cve: "CVE-2026-66080"
severity: "MEDIUM"
cvss: 5.9
epss: "2.8%"
vendor: "rabbitmq"
kev: false
exploited: false
published: "2026-09-23 21:16:59"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T21:00:50+02:00"
---

# CVE-2026-66080

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 8a56c37f099a7bf609a555de3f0ff8ed23964d20 (Commit)

## Referenzen

- <https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728>
- <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6>
- <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66080) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_