---
cve: "CVE-2026-77403"
severity: "HIGH"
cvss: 8.9
epss: "0.4%"
vendor: "rabbitmq"
kev: false
exploited: false
published: "2026-09-16 15:17:46"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T18:40:59+02:00"
---

# CVE-2026-77403

> 8.9 HIGH · 🧪 PoC

## Beschreibung

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 2e0a919b89f337dbf58db2bb34ab206dac354a06 (Commit)
- d26d57e952cc61554ea9c54bd676c8f40ed0d84d (Commit)

## Referenzen

- <https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-xwwf-m8fg-p9q2>
- <https://github.com/rabbitmq/amqp091-go/pull/353>
- <https://github.com/rabbitmq/amqp091-go/commit/2e0a919b89f337dbf58db2bb34ab206dac354a06>
- <https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77403) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_