{"id":"EM-20261110-9JOG","url":"https://cyber.eventmonitor.net/incident/EM-20261110-9JOG/active-support-vulnerability-cve-2026-126080/","type":"cve","title":"Active Support Vulnerability (CVE-2026-126080)","subtitle":"CVE-2026-126080","subject":"CVE-2026-126080","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-10T21:34:11.000Z","firstSignal":"2026-11-10T21:19:26.663Z","lastSignal":"2026-11-10T21:34:11.000Z","updated":"2026-11-10T22:24:45.599Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T21:34:11.000Z","why":"second independent source: C26 GitHub Advisory Database"},{"status":"Developing","at":"2026-11-10T21:34:11.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T21:19:26.663Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-10T21:34:11.000Z","what":"Born: second source, C26 GitHub Advisory Database. Page EM-20261110-9JOG created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T21:19:26.663Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T21:19:26.663Z","detail":"CVSS 7.5"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T21:19:26.663Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-126080 (CVSS 7.5)","text":"Active Support is a collection of utility classes and standard library extensions used by Rails and other Ruby projects. Prior to 8.1.4.1 and 8.0.5.2, when constant lookup raises LoadError, ActiveSupport::Inflector#safe_constantize (and String#safe_constantize) builds a regular expression from the requested constant name without escaping it, so a caller that passes untrusted input lets the attacker choose the source of a pattern that the application compiles. Crafted patterns can trigger defects in Ruby's regular expression compiler, possibly leading to a crash of the server process, and…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126080"},{"at":"2026-11-10T21:34:11.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":3,"title":"GHSA-8474-xrp6-wh69 / CVE-2026-126080: Active Support: Possible DoS vulnerability in Active Support safe_constantize","text":"rubygems:activesupport, rubygems:activesupport","url":"https://github.com/advisories/GHSA-8474-xrp6-wh69"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T21:19:26.663","score":7.5,"severity":"HIGH","desc":"Active Support is a collection of utility classes and standard library extensions used by Rails and other Ruby projects. Prior to 8.1.4.1 and 8.0.5.2, when constant lookup raises LoadError, ActiveSupport::Inflector#safe_constantize (and String#safe_constantize) builds a regular expression from the…","product":"","seen":1794349485599},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}