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5.6 KiB
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5.6 KiB
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{"schema_version":"1.9.2","id":"GHSA-3f4q-8x5m-76v8","published":"2026-11-12T21:54:18Z","modified":"2026-11-12T22:00:04.075403782Z","aliases":["CVE-2026-126188"],"summary":"Active Storage: Possible local file disclosure in video previews and analysis","details":"### Impact\nActive Storage's `VideoPreviewer`, `VideoAnalyzer` and `AudioAnalyzer` run `ffmpeg` and `ffprobe` on a blob's contents without restricting the input format, so FFmpeg selects a demuxer by probing the file. A blob created through a direct upload keeps the content type the client declared, so a client can store an HLS playlist under a `video/*` or `audio/*` type. When that blob is previewed or analyzed, the `hls` demuxer opens the `file://` segments that the playlist names, and the preview image or the stored metadata could disclose a local media file that the application process can read and whose path the attacker knows.\n\nApplications that accept uploads from untrusted users and generate video previews, or analyze video or audio attachments with FFmpeg, are affected.\n\n### Details\nThe fixed releases limit the formats FFmpeg may open to common audio and video containers, configured by the new `config.active_storage.ffmpeg_allowed_formats` setting. Files in other formats no longer preview or receive media metadata; the Active Storage CHANGELOG names some of them and shows how to add a format to the list.\n\n### Workarounds\nApplications that cannot upgrade can stop Active Storage from running FFmpeg on uploaded files by removing `ActiveStorage::Previewer::VideoPreviewer` from `config.active_storage.previewers`, and `ActiveStorage::Analyzer::VideoAnalyzer` and `ActiveStorage::Analyzer::AudioAnalyzer` from `config.active_storage.analyzers`.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\nPatches for those who cannot upgrade at once:\n- 8.1: https://github.com/rails/rails/commit/3b1f2627538dc597cd973530c08514a26c2b0282.patch\n- 8.0: https://github.com/rails/rails/commit/69aff80d115bbb9d1e82fd6c6f2fd3ddeafb958b.patch\n\n### Credit\nThis issue was responsibly reported by HackerOne researcher [w3rmut](https://hackerone.com/w3rmut).","affected":[{"package":{"name":"activestorage","ecosystem":"RubyGems","purl":"pkg:gem/activestorage"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.1.0.beta1"},{"fixed":"8.1.4.1"}]}],"versions":["8.1.0","8.1.0.beta1","8.1.0.rc1","8.1.1","8.1.2","8.1.2.1","8.1.3","8.1.3.1","8.1.4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-3f4q-8x5m-76v8/GHSA-3f4q-8x5m-76v8.json"}},{"package":{"name":"activestorage","ecosystem":"RubyGems","purl":"pkg:gem/activestorage"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.5.2"}]}],"versions":["0.1","5.2.0","5.2.0.beta1","5.2.0.beta2","5.2.0.rc1","5.2.0.rc2","5.2.1","5.2.1.1","5.2.1.rc1","5.2.2","5.2.2.1","5.2.2.rc1","5.2.3","5.2.3.rc1","5.2.4","5.2.4.1","5.2.4.2","5.2.4.3","5.2.4.4","5.2.4.5","5.2.4.6","5.2.4.rc1","5.2.5","5.2.6","5.2.6.1","5.2.6.2","5.2.6.3","5.2.7","5.2.7.1","5.2.8","5.2.8.1","6.0.0","6.0.0.beta1","6.0.0.beta2","6.0.0.beta3","6.0.0.rc1","6.0.0.rc2","6.0.1","6.0.1.rc1","6.0.2","6.0.2.1","6.0.2.2","6.0.2.rc1","6.0.2.rc2","6.0.3","6.0.3.1","6.0.3.2","6.0.3.3","6.0.3.4","6.0.3.5","6.0.3.6","6.0.3.7","6.0.3.rc1","6.0.4","6.0.4.1","6.0.4.2","6.0.4.3","6.0.4.4","6.0.4.5","6.0.4.6","6.0.4.7","6.0.4.8","6.0.5","6.0.5.1","6.0.6","6.0.6.1","6.1.0","6.1.0.rc1","6.1.0.rc2","6.1.1","6.1.2","6.1.2.1","6.1.3","6.1.3.1","6.1.3.2","6.1.4","6.1.4.1","6.1.4.2","6.1.4.3","6.1.4.4","6.1.4.5","6.1.4.6","6.1.4.7","6.1.5","6.1.5.1","6.1.6","6.1.6.1","6.1.7","6.1.7.1","6.1.7.10","6.1.7.2","6.1.7.3","6.1.7.4","6.1.7.5","6.1.7.6","6.1.7.7","6.1.7.8","6.1.7.9","7.0.0","7.0.0.alpha1","7.0.0.alpha2","7.0.0.rc1","7.0.0.rc2","7.0.0.rc3","7.0.1","7.0.10","7.0.2","7.0.2.1","7.0.2.2","7.0.2.3","7.0.2.4","7.0.3","7.0.3.1","7.0.4","7.0.4.1","7.0.4.2","7.0.4.3","7.0.5","7.0.5.1","7.0.6","7.0.7","7.0.7.1","7.0.7.2","7.0.8","7.0.8.1","7.0.8.2","7.0.8.3","7.0.8.4","7.0.8.5","7.0.8.6","7.0.8.7","7.1.0","7.1.0.beta1","7.1.0.rc1","7.1.0.rc2","7.1.1","7.1.2","7.1.3","7.1.3.1","7.1.3.2","7.1.3.3","7.1.3.4","7.1.4","7.1.4.1","7.1.4.2","7.1.5","7.1.5.1","7.1.5.2","7.1.6","7.2.0","7.2.0.beta1","7.2.0.beta2","7.2.0.beta3","7.2.0.rc1","7.2.1","7.2.1.1","7.2.1.2","7.2.2","7.2.2.1","7.2.2.2","7.2.3","7.2.3.1","7.2.3.2","7.2.4","8.0.0","8.0.0.1","8.0.0.beta1","8.0.0.rc1","8.0.0.rc2","8.0.1","8.0.2","8.0.2.1","8.0.3","8.0.4","8.0.4.1","8.0.5","8.0.5.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-3f4q-8x5m-76v8/GHSA-3f4q-8x5m-76v8.json"}}],"references":[{"type":"WEB","url":"https://github.com/rails/rails/security/advisories/GHSA-3f4q-8x5m-76v8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126188"},{"type":"WEB","url":"https://github.com/rails/rails/commit/3b1f2627538dc597cd973530c08514a26c2b0282"},{"type":"WEB","url":"https://github.com/rails/rails/commit/69aff80d115bbb9d1e82fd6c6f2fd3ddeafb958b"},{"type":"PACKAGE","url":"https://github.com/rails/rails"},{"type":"WEB","url":"https://github.com/rails/rails/releases/tag/v8.0.5.2"},{"type":"WEB","url":"https://github.com/rails/rails/releases/tag/v8.1.4.1"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/GHSA-3f4q-8x5m-76v8.yml"}],"database_specific":{"cwe_ids":["CWE-200"],"github_reviewed":true,"github_reviewed_at":"2026-11-12T21:54:18Z","nvd_published_at":"2026-11-11T00:18:47Z","severity":"LOW"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"}]} |