---
cve: "CVE-2026-29178"
severity: "HIGH"
cvss: 7.7
epss: "27%"
vendor: "LemmyNet"
kev: false
exploited: false
published: "2026-03-06 18:16:20"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T06:43:36+02:00"
---

# CVE-2026-29178

> 7.7 HIGH · 🧪 PoC

## Beschreibung

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. Prior to version 0.19.16, the GET /api/v4/image/{filename} endpoint is vulnerable to unauthenticated SSRF through parameter injection in the file_type query parameter. An attacker can inject arbitrary query parameters into the internal request to pict-rs, including the proxy parameter which causes pict-rs to fetch arbitrary URLs. This issue has been patched in version 0.19.16.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- f47a03f56d1797bceab5f34b6f624c91cecd5871 (Commit)

## Referenzen

- <https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3>
- <https://github.com/LemmyNet/lemmy/commit/f47a03f56d1797bceab5f34b6f624c91cecd5871>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-29178) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_