Threats Tagged 'cve-2026-42181'
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Threats Tagged 'cve-2026-42181'
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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. Join the discussion | CVE Database V5 | 05/08/2026, 19:26:07 UTC Added: 05/08/2026, 20:06:26 UTC |
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