Vulnerability details

CVE-2026-29178

LemmyNet lemmy

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

CVSS 4.0

7.7High

Official description

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 scores

Score	Version	Source	Vector
7.7High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
LemmyNet	lemmy	< 0.19.16	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-03-06
Last updated: 2026-03-06
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.28%

Probability of exploitation in 30 days

21.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-918
Server-Side Request Forgery (SSRF)