CVE-2026-29178 describes an unauthenticated Server-Side Request Forgery (SSRF) vulnerability in Lemmy, a fediverse link aggregator, affecting versions prior to 0.19.16. This flaw, rooted in the activitypub_federation dependency, allows attackers to inject parameters into the GET /api/v4/image/{filename} endpoint, forcing the pict-rs service to fetch arbitrary URLs. With a CVSS score of 7.7 (HIGH), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to significant information disclosure. Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| LemmyNet | Lemmy | < 0.19.16CNA affected |
CVSS version used by this source: 4.0
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.