{"id":"EM-20261030-1CMD","url":"https://cyber.eventmonitor.net/incident/EM-20261030-1CMD/","type":"cve","title":"Critical ssl_verify_fun Vulnerability (CVE-2026-117666)","subtitle":"CVE-2026-117666","subject":"CVE-2026-117666","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-10-30T21:16:51.447Z","firstSignal":"2026-10-30T20:22:16.000Z","lastSignal":"2026-10-30T21:16:51.447Z","updated":"2026-11-04T14:43:58.877Z","revision":1,"life":[{"status":"Born","at":"2026-10-30T21:16:51.447Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-10-30T21:16:51.447Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-10-30T20:22:16.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-10-30T21:16:51.447Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261030-1CMD created."},{"at":"2026-10-30T21:16:51.447Z","what":"Severity raised to Critical by C6"}],"stages":[{"name":"Disclosed","at":"2026-10-30T21:16:51.447Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-10-30T21:16:51.447Z","detail":"CVSS 9.1 · EPSS 0.2%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-10-30T20:22:16.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-10-30T20:22:16.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":2,"title":"Red Hat: CVE-2026-117666 (moderate)","text":"ssl_verify_fun: ssl_verify_fun: partial-label wildcard certificate matches hostnames across a label boundary","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-117666.json"},{"at":"2026-10-30T21:16:51.447Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-117666 (CVSS 9.1)","text":"Improper Validation of Certificate with Host Mismatch vulnerability in deadtrickster ssl_verify_fun allows an adversary in the middle to impersonate a TLS peer via a certificate that carries a partial-label wildcard. try_match_wildcard/4 in src/ssl_verify_hostname.erl anchors only the text before and after the * of an identifier such as f*.example.net, so the wildcard also consumes dots and the certificate is accepted for f.evil.example.net. RFC 6125 confines a wildcard to the left-most label. The same matcher lets *.168.1.1 match the IP literal 192.168.1.1. Whole-label wildcards are matched c","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117666"}],"crowd":[],"reference":{"nvd":{"published":"2026-10-30T21:16:51.447","score":9.1,"severity":"CRITICAL","desc":"Improper Validation of Certificate with Host Mismatch vulnerability in deadtrickster ssl_verify_fun allows an adversary in the middle to impersonate a TLS peer via a certificate that carries a partial-label wildcard. try_match_wildcard/4 in src/ssl_verify_hostname.erl anchors only the text before an","product":"","seen":1793803438877},"kev":null,"epss":{"epss":0.0019,"pct":0.08724,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}