CVE-2026-29178CWE-918

Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint

High · published March 6, 2026

CVSS v4.0
7.7
EPSS
0%
Percentile
37.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.7 · HIGH
Vector
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
EPSS
0.00438 · 37.0th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-03-06T17:56Z
EPSS history
Timeline
  • 06 MAR 17:56Z
    Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint
    cvelistv5