---
cve: "CVE-2026-67242"
severity: "MEDIUM"
cvss: 6.3
epss: "0.5%"
vendor: "rabbitmq"
kev: false
exploited: false
published: "2026-09-25 17:17:12"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T03:28:41+02:00"
---

# CVE-2026-67242

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.9 and 4.3.3, OAuth2 isinteger(Exp) guard skips token-expiry checks for float exp. validatetokenexpiry/1 (lines 208-214) and expirytimestamp/1 (138-144) both guard with 'when isinteger(Exp)' and fall through to ok/never for float values. josejwt:verify validates only the signature, not exp. With float exp, no expiry validation occurs anywhere in the If the IdP emits exp as a JSON float (RFC 7519 permits fractional NumericDate), both the login-time expiry check and the mid-connection disconnect timer are silently skipped , an already-expired token is accepted, and connections never time OAuth2 backend enabled IdP emits float exp (uncommon; mainstream IdPs emit integers) Attacker possesses a previously-valid signed. This issue is fixed in versions 4.2.9 and 4.3.3.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 47d6d6457c7d1a440daed643cb7d76bba313e79c (Commit)
- 1d284b2d2a1e2f845ad22b0d5ee38ec372d50802 (Commit)

## BSI-Hinweise (deutsch)

- [RabbitMQ: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2485) — _BSI-Einstufung: mittel_
  Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in RabbitMQ ausnutzen, um Denial-of-Service-Angriffe durchzuführen, Autorisierungs- und Mandantengrenzen zu umgehen, Daten zu manipulieren oder offenzulegen und Cross Site Scripting Angriffe durchzuführen.

## Referenzen

- <https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rrj4-g94f-rqj9>
- <https://github.com/rabbitmq/rabbitmq-server/commit/d10a369a96658d0fba1050bd43c732e58fcf28fd>
- <https://github.com/rabbitmq/rabbitmq-server/commit/f189a8824c9efbce46bd9438fcdbda4521cfc923>
- <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9>
- <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67242) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_