---
cve: "CVE-2026-57585"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "msgpack"
kev: false
exploited: false
published: "2026-06-30 21:36:23"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-25T12:45:52+02:00"
---

# CVE-2026-57585

> 7.5 HIGH · 🧪 PoC

## Beschreibung

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack.  If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 448d43f5dcca7b3a2b0810e161af0a6431d90071 (Commit)
- 2c56ddb5d0025ed481d962c0f5d62d19dec7476d (Commit)

## Referenzen

- <https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964>
- <https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-57585) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_