---
cve: "CVE-2026-67220"
severity: "MEDIUM"
cvss: 6.0
epss: "2.1%"
vendor: "rabbitmq"
kev: false
exploited: false
published: "2026-09-23 21:17:00"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T11:21:21+02:00"
---

# CVE-2026-67220

> 6.0 MEDIUM · 🧪 PoC

## Beschreibung

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.0, When a binding is created on an x-jms-topic exchange, add_binding/3 reads the rjms_erlang_selector argument and passes it through erl_scan:string/1 then erl_parse:parse_term/1. erl_scan:string/1 interns every atom literal it tokenizes. validate_binding/2 is a no-op (-> ok.), there is no length cap, and the surrounding try/catch cannot reclaim atoms. The Java JMS client compiles selectors client-side, but the server does not enforce this , a raw AMQP client can send arbitrary selector strings. An authenticated low-privilege AMQP user confined to one vhost can crash the entire broker node (cross-tenant DoS) in

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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 | Gering | warn |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-r3qr-4h63-mvj2>
- <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67220) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_