---
cve: "CVE-2026-55206"
severity: "HIGH"
cvss: 8.7
epss: "21%"
vendor: "miurahr"
kev: false
exploited: false
published: "2026-07-08 21:16:49"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T23:51:48+02:00"
---

# CVE-2026-55206

> 8.7 HIGH · 🧪 PoC

## Beschreibung

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3.

## CVSS-Vektor

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

## Patch verfügbar (OSV)

- d7aa3a197d15c75a65b24f796d3a69f83806d3f8 (Commit)
- e278bc05cc937ecd1ee62bc6a058db3a21e66614 (Commit)

## Referenzen

- <https://github.com/miurahr/py7zr/security/advisories/GHSA-h4gh-22qq-72r7>
- <https://github.com/miurahr/py7zr/commit/d7aa3a197d15c75a65b24f796d3a69f83806d3f8>
- <https://github.com/miurahr/py7zr/releases/tag/v1.1.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55206) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_