GHSA-H6HF-9846-XWRQ Lemmy has SSRF and internal image disclosure in post link metadata via unvalidated og:image

Summary 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...