CVE-2026-42181
Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image
Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy fetches metadata for user-supplied post URLs and, under the default StoreLinkPreviews image mode, downloads the preview image through local pict-rs. While the top-level page URL is checked against internal IP ranges, the extracted og:image URL is not subject to the same restriction. As a result, an authenticated low-privileged user can submit an attacker-controlled public page whose Open Graph image points to an internal image endpoint. Lemmy will fetch that internal image server-side and store a local thumbnail that can then be served back to users. This issue has been patched in version 0.19.18.
| CWE | CWE-918 |
| Vendor | lemmynet |
| Product | lemmy |
| Published | May 8, 2026 |
Get instant alerts for lemmynet lemmy
Be the first to know when new medium vulnerabilities affecting lemmynet lemmy are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N