---
cve: "CVE-2026-54269"
severity: "MEDIUM"
cvss: 5.3
epss: "40%"
vendor: "protobufjs"
kev: false
exploited: false
published: "2026-06-22 18:16:45"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T10:10:21+02:00"
---

# CVE-2026-54269

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 8.6.0 and 7.6.3, protobufjs accepted certain schema-derived names that could collide with properties used by protobufjs runtime helpers. The known affected names are fields named hasOwnProperty, field or oneof names such as $type when loaded through protobufjs JSON/reflection descriptors, and service methods whose generated helper name is rpcCall. When affected message or service types were used, protobufjs could read schema-controlled data where it expected an own-property helper, reflected type metadata, or the base RPC helper. This could cause deterministic exceptions or recursive calls in affected decode post-checks, verification, object conversion, reflected JSON serialization, or protobufjs RPC helper invocation. This vulnerability is fixed in 8.6.0 and 7.6.3.

## 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)

- 1d3796d7d29830c73eec792ccbe769be6aa020ac (Commit)
- 8631d9b8aaad5d686cc7f374f143f3872f55e9cd (Commit)

## Referenzen

- <https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-f38q-mgvj-vph7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54269) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_