---
cve: "CVE-2026-25520"
severity: "CRITICAL"
cvss: 10.0
epss: "0.8%"
vendor: "nyariv"
kev: false
exploited: false
published: "2026-02-06 20:16:10"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T12:27:17+02:00"
---

# CVE-2026-25520

> 10.0 CRITICAL · 🧪 PoC

## Beschreibung

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 67cb186c41c78c51464f70405504e8ef0a6e43c3 (Commit)

## Referenzen

- <https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4>
- <https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-25520) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_