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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jvxv-2jjp-jxc3 Lemmy has unauthenticated SSRF via file_type query parameter injection in image endpoint
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 06 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
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.
Title Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint
Weaknesses CWE-918
References
Metrics cvssV4_0

{'score': 7.7, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-06T18:33:08.993Z

Reserved: 2026-03-04T14:44:00.713Z

Link: CVE-2026-29178

cve-icon Vulnrichment

Updated: 2026-03-06T18:32:57.675Z

cve-icon NVD

Status : Received

Published: 2026-03-06T18:16:20.650

Modified: 2026-03-06T19:16:22.017

Link: CVE-2026-29178

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses