{"api_version":"1","generated_at":"2026-11-10T23:06:05+00:00","cve":"CVE-2026-126085","urls":{"html":"https://cve.report/CVE-2026-126085","api":"https://cve.report/api/cve/CVE-2026-126085.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-126085","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-126085"},"summary":{"title":"Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage","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.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-11-10 22:18:31","updated_at":"2026-11-10 22:18:31"},"problem_types":["CWE-602","CWE-602 CWE-602: Client-Side Enforcement of Server-Side Security"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2","name":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7","name":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","name":"https://github.com/rails/rails/releases/tag/v8.1.4.1","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c","name":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","name":"https://github.com/rails/rails/releases/tag/v8.0.5.2","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-126085","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126085","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"rails","product":"rails","version":"affected >= 8.1, < 8.1.4.1","platforms":[]},{"source":"CNA","vendor":"rails","product":"rails","version":"affected < 8.0.5.2","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"rails","vendor":"rails","versions":[{"status":"affected","version":">= 8.1, < 8.1.4.1"},{"status":"affected","version":"< 8.0.5.2"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-602","description":"CWE-602: Client-Side Enforcement of Server-Side Security","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-10T21:12:44.814Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2"},{"name":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c"},{"name":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7"},{"name":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2"},{"name":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1"}],"source":{"advisory":"GHSA-hfr4-8rjc-97m2","discovery":"UNKNOWN"},"title":"Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-126085","datePublished":"2026-11-10T21:12:44.814Z","dateReserved":"2026-11-10T17:07:43.285Z","dateUpdated":"2026-11-10T21:12:44.814Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-10 22:18:31","lastModifiedDate":"2026-11-10 22:18:31","problem_types":["CWE-602","CWE-602 CWE-602: Client-Side Enforcement of Server-Side Security"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"126085","Ordinal":"1","Title":"Active Storage: Possible circumvention of file size limits in Ac","CVE":"CVE-2026-126085","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"126085","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Active Storage: Possible circumvention of file size limits in Ac"}]}}}