---
cve: "CVE-2026-57439"
severity: "MEDIUM"
cvss: 5.0
epss: "9%"
vendor: "gchq"
kev: false
exploited: false
published: "2026-07-08 16:16:31"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T08:24:07+02:00"
---

# CVE-2026-57439

> 5.0 MEDIUM · 🧪 PoC

## Beschreibung

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 85db3be5d0096859b810f0e8d3e151d5dc9b948f (Commit)
- d358d82cbcb269d764a2deb598a37043bd054f45 (Commit)

## Referenzen

- <https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c>
- <https://github.com/gchq/CyberChef/issues/2568>
- <https://github.com/gchq/CyberChef/pull/2569>
- <https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f>
- <https://github.com/gchq/CyberChef/releases/tag/v11.2.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-57439) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_