{"schema":"threatline.record/2","record":{"id":"CVE-2026-100665","aliases":["GHSA-mj35-3qqm-q387"],"summary":"Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass","details":"Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.","categories":["Frameworks"],"product":"netty","vendor":"netty","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100665","source_modified_at":"2026-10-02T15:46:37.467Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"netty","vendor":"netty","versions":[{"version":"4.2.11.Final","status":"affected","versionType":"custom","lessThan":"4.2.18.Final"},{"version":"4.2.18.Final","status":"unaffected","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100665","source_modified_at":"2026-10-02T15:46:37.467Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"netty","ecosystem":null},"version":"4.2.18.Final","basis":"first unaffected version stated in the CVE record"}],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00291,"percentile":0.20509,"score_date":"2026-10-23"},"published_at":"2026-09-26T13:23:31.242Z","modified_at":"2026-10-02T15:46:37.467Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100665","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-02T15:46:37.467Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100665","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/netty/netty/security/advisories/GHSA-mj35-3qqm-q387","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/netty/netty/commit/09e72c4fd8007277121ed48db63a124b112b96fe","tags":["patch"]},{"source":"CVE List","url":"https://github.com/netty/netty/commit/994e887ed9","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/netty-4.2.11-through-4.2.17-quic-hostname-verification-bypass","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-02T15:46:31.371553Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-02T15:46:37.467Z","content_hash":"6ad88de3ff340689fb58e3ccc98659749db771bc42dd74c8984c5250fed424ab"}}