---
cve: "CVE-2026-42462"
severity: "HIGH"
cvss: 7.0
epss: "17%"
vendor: "fedify-dev"
kev: false
exploited: false
published: "2026-06-10 22:16:57"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T14:39:09+02:00"
---

# CVE-2026-42462

> 7.0 HIGH · 🧪 PoC

## Beschreibung

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.

## CVSS-Vektor

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

| 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 | Gering | warn |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 8140088d6572fde6442b31902f1648b3afcc6bcd (Commit)
- 5a5802e75da8e217173709cb15657b975b725c90 (Commit)

## Referenzen

- <https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367>
- <https://github.com/fedify-dev/fedify/releases/tag/2.2.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42462) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_