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Advisory record · GHSA-jvxv-2jjp-jxc3

Lemmy has unauthenticated SSRF via file_type query parameter injection in image endpoint

CVSS 7.7 HighEPSS 0.0029 · 21st percentile

Published by the GitHub Advisory Database at 4 Mar 2026, 20:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
lemmy_routescrates.io<0.19.160.19.16
Identifiers
GHSA-jvxv-2jjp-jxc3 · CVE-2026-29178
Weakness (CWE)
CWE-918
Tags
Published
4 Mar 2026
Updated
6 Mar 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Lemmy's lemmy_routes crate, versions before 0.19.16, is vulnerable to server-side request forgery through the unauthenticated GET /api/v4/image/{filename} endpoint. The file_type query parameter is inserted into the internal request to pict-rs without validation, so an attacker can inject a proxy parameter and make pict-rs fetch arbitrary URLs, potentially reaching cloud metadata services or internal services and returning the response to the attacker. Upgrade lemmy_routes to version 0.19.16 or later.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.7 High 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0029, the 21st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:19 UTC First seen by agentprime
  2. 31 Oct 2026, 15:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.