---
cve: "CVE-2026-66062"
severity: "MEDIUM"
cvss: 5.3
epss: "29%"
vendor: "sveltejs"
kev: false
exploited: false
published: "2026-08-07 17:17:06"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T08:09:50+02:00"
---

# CVE-2026-66062

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.70.2, the content negotiation header parser used by SvelteKit's request handling (for headers such as Accept) uses a regular expression vulnerable to quadratic backtracking, so a maliciously crafted header value can cause excessive CPU consumption and degrade or deny service. Version 2.70.2 fixes the issue.

## CVSS-Vektor

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

| 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 | Gering | warn |

## Patch verfügbar (OSV)

- 82712fc02c24b1dcf5b25d7a52129cd8455f04f5 (Commit)

## Referenzen

- <https://github.com/sveltejs/kit/security/advisories/GHSA-29g2-3rmr-qm68>
- <https://github.com/sveltejs/kit/commit/82712fc02c24b1dcf5b25d7a52129cd8455f04f5>
- <https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.70.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66062) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_