{"id":"EM-20261110-ED29","url":"https://cyber.eventmonitor.net/incident/EM-20261110-ED29/activestorage-vulnerability-cve-2026-126074/","type":"cve","title":"activestorage Vulnerability (CVE-2026-126074)","subtitle":"CVE-2026-126074","subject":"CVE-2026-126074","status":"Developing","severity":"medium","affected":[],"headline":null,"born":"2026-11-10T21:33:12.000Z","firstSignal":"2026-11-10T20:48:25.000Z","lastSignal":"2026-11-10T21:33:12.000Z","updated":"2026-11-11T12:38:43.721Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T21:33:12.000Z","why":"second independent source: C26 GitHub Advisory Database"},{"status":"Developing","at":"2026-11-10T21:33:12.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T20:48:25.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-10T21:33:12.000Z","what":"Born: second source, C26 GitHub Advisory Database. Page EM-20261110-ED29 created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T21:19:25.720Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T21:19:25.720Z","detail":"CVSS 4.3"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-10T20:48:25.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T20:48:25.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":2,"title":"Red Hat: CVE-2026-126074 (moderate)","text":"activestorage: activestorage: Denial of Service via filenames containing null bytes","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-126074.json"},{"at":"2026-11-10T21:33:12.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":2,"title":"GHSA-p2pm-g2h6-7j5j / CVE-2026-126074: Active Storage: Possible DoS vulnerability in Active Storage filename handling","text":"rubygems:activestorage, rubygems:activestorage","url":"https://github.com/advisories/GHSA-p2pm-g2h6-7j5j"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T21:19:25.720","score":4.3,"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::Filename#base and #extension_with_delimiter, and therefore #extension, pass the stored filename unmodified to File.basename…","product":"","seen":1794353084878},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}