{"id":"GHSA-hfr4-8rjc-97m2","summary":"Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage","details":"### Impact\n`ActiveStorage::Service::GCSService#url_for_direct_upload` does not bind the declared content length into the signed direct-upload URL, and `#headers_for_direct_upload` returns no length constraint, so the URL authorizes an upload body of any size. A direct-upload client could store a file larger than the `byte_size` it declared, and the resulting blob keeps the declared size, possibly bypassing application file size validations and quotas. This is the weakness that CVE-2020-8162 fixed in the S3 service.\n\nApplications that store files in Google Cloud Storage and accept direct uploads are affected.\n\n### Details\nThe fixed releases sign an `x-goog-content-length-range` header that matches the blob's declared `byte_size` and return it from `headers_for_direct_upload`, so Cloud Storage rejects an upload body of any other size. Browsers send this header with the direct upload, so a bucket's CORS configuration must list `x-goog-content-length-range` in `responseHeader`, or browser direct uploads fail after the upgrade. The Active Storage CHANGELOG and the CORS example in the Active Storage guide show the change.\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/e19916cea31cbfb0030b165ae853b741f8dd57a7.patch\n- 8.0: https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c.patch\n\n### Credit\nThis issue was responsibly reported by HackerOne researcher [f4cts](https://hackerone.com/f4cts).","aliases":["CVE-2026-126085"],"modified":"2026-11-10T21:45:04.240426616Z","published":"2026-11-10T21:37:19Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-602"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-11-10T21:37:19Z"},"references":[{"type":"WEB","url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2"},{"type":"WEB","url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c"},{"type":"WEB","url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7"},{"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-hfr4-8rjc-97m2.yml"}],"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-hfr4-8rjc-97m2/GHSA-hfr4-8rjc-97m2.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-hfr4-8rjc-97m2/GHSA-hfr4-8rjc-97m2.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}