---
cve: "CVE-2026-54335"
severity: "LOW"
cvss: 3.7
epss: "26%"
vendor: "feathersjs"
kev: false
exploited: false
published: "2026-07-17 22:17:44"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T05:27:47+02:00"
---

# CVE-2026-54335

> 3.7 LOW · 🧪 PoC

## Beschreibung

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target['__proto__'] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 28b3c03c63bdbff53115fdaa46c56980e7942acc (Commit)
- 6cb38594f88c47562f8f96f70a5492f3b6bd0ba8 (Commit)

## Referenzen

- <https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh>
- <https://github.com/feathersjs/feathers/pull/3690>
- <https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc>
- <https://github.com/feathersjs/feathers/releases/tag/v5.0.45>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54335) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_