{"id":"EM-20261110-YWCJ","url":"https://cyber.eventmonitor.net/incident/EM-20261110-YWCJ/activestorage-vulnerability-cve-2026-126085/","type":"cve","title":"activestorage Vulnerability (CVE-2026-126085)","subtitle":"CVE-2026-126085","subject":"CVE-2026-126085","status":"Developing","severity":"medium","affected":[],"headline":null,"born":"2026-11-10T21:37:19.000Z","firstSignal":"2026-11-10T21:12:44.000Z","lastSignal":"2026-11-10T21:37:19.000Z","updated":"2026-11-11T12:38:43.721Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T21:37:19.000Z","why":"second independent source: C26 GitHub Advisory Database"},{"status":"Developing","at":"2026-11-10T21:37:19.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T21:12:44.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-10T21:37:19.000Z","what":"Born: second source, C26 GitHub Advisory Database. Page EM-20261110-YWCJ created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T22:18:31.413Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T22:18:31.413Z","detail":"CVSS 5.3"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-10T21:12:44.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T21:12:44.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":2,"title":"Red Hat: CVE-2026-126085 (moderate)","text":"activestorage: Active Storage: File size validation bypass via missing direct-upload content length constraints","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-126085.json"},{"at":"2026-11-10T21:37:19.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":2,"title":"GHSA-hfr4-8rjc-97m2 / CVE-2026-126085: Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage","text":"rubygems:activestorage, rubygems:activestorage","url":"https://github.com/advisories/GHSA-hfr4-8rjc-97m2"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T22:18:31.413","score":5.3,"severity":"MEDIUM","desc":"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…","product":"","seen":1794357664905},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}