Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/LemmyNet/lemmy/commit/f47a03f56d1797bceab5f34b6f624c91cecd587
- https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3
- https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3
FAQ
What is CVE-2026-29178?
CVE-2026-29178 is a documented vulnerability. 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 ...
How severe is CVE-2026-29178?
CVSS scoring is not yet available for CVE-2026-29178. Check NVD for updates.
Is there a patch for CVE-2026-29178?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.