{"id":"CVE-2026-126085","published":"2026-11-10T22:18:31.413","lastModified":"2026-11-10T22:18:31.413","description":"Active Storage makes it simple to upload and reference files in cloud services and attach those files to Active Record objects. Prior to 8.1.4.1 and 8.0.5.2, 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. Applications that store files in Google Cloud Storage and accept direct uploads are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-602"],"vendors":[],"products":[],"references":[{"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c","tags":[]},{"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":[]},{"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2","tags":[]}],"exploitRefs":[{"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c","tags":[]},{"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":[]},{"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2","tags":[]}],"hasPoc":true,"ai":null}