{"id":"EUVD-2026-28820","revision":"96d63b53908c45c48b65f2a9357ce027","records":[{"revision":"96d63b53908c45c48b65f2a9357ce027","observedAt":"2026-10-28T05:12:21.134+00:00","statement":{"source":"euvd","id":"EUVD-2026-28820","aliases":["CVE-2026-42181"],"title":"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. Whi…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":null}],"references":["https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq","https://github.com/LemmyNet/lemmy/releases/tag/0.19.18"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28820","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 8, 2026, 7:26:07 PM","dateUpdated":"May 11, 2026, 4:01:01 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-28820","identifiers":["EUVD-2026-28820","CVE-2026-42181"]},"retained":false,"historicalAffected":[]}],"coverage":[]}