CVE-2026-29178 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in Lemmy, a link aggregator and forum for the fediverse, through its dependency on activitypub_federation, a Rust framework for ActivityPub federation. This vulnerability affects versions of Lemmy prior to 0.19.16. The issue arises in the GET /api/v4/image/{filename} endpoint, which is susceptible to unauthenticated SSRF via parameter injection in the file_type query parameter. An attacker can exploit this by injecting arbitrary query parameters into the internal request to pict-rs, including the proxy parameter, which directs pict-rs to fetch arbitrary URLs. The vulnerability has been patched in version 0.19.16.
Users can update to Lemmy version 0.19.16 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 6, 2026CISA-ADP
Assessed Mar 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/LemmyNet/lemmy/commit/f47a03f56d1797bceab5f34b6f624c91cecd5871 | [email protected] | Source CodeVendor |
| https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Lemmy | <= 0.19.15 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 6, 2026 | CVE Modified | CISA-ADP |
| Mar 6, 2026 | New CVE Received | [email protected] |