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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.","epss":{"date":"2026-11-13","percentile":0.41993,"score":0.0048},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: security-advisories@github.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1794625747344,"publishedAt":1794345164814,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2"},{"source":"OSV / GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/advisories/GHSA-hfr4-8rjc-97m2"},{"source":"OSV / GitHub Security Advisories","tags":["osv"],"url":"https://osv.dev/vulnerability/GHSA-hfr4-8rjc-97m2"}],"remediation":[{"kind":"fix","source":"OSV GHSA-hfr4-8rjc-97m2","text":"activestorage (RubyGems): OSV reports a fixed version 8.1.4.1. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-hfr4-8rjc-97m2"},{"kind":"fix","source":"OSV GHSA-hfr4-8rjc-97m2","text":"activestorage (RubyGems): OSV reports a fixed version 8.0.5.2. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-hfr4-8rjc-97m2"}],"revision":"fa9ab8991fadc93c7751d92d289e1b161712aecc00e362844a80f6a8512d2ccc","sources":[{"modifiedAt":1794625747344,"name":"CNA: GitHub_M","retrievedAt":1794629317290,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126085"},{"modifiedAt":1794521461153,"name":"NVD","retrievedAt":1794529323033,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126085"},{"modifiedAt":1794347104240,"name":"OSV / GitHub Security Advisories","retrievedAt":1794352501532,"url":"https://osv.dev/vulnerability/GHSA-hfr4-8rjc-97m2"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794629327482,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126085"}],"ssvc":{"assessedAt":1794625737080,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage","updatedAt":1794629327482}