{"id":"CVE-2026-100665","title":"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","summary":"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 SSLEn…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-295"],"vendor":"netty","product":"netty","affected":["netty >= 4.2.11.Final < 4.2.18.Final"],"published":"2026-09-26","updated":"2026-09-26","sourceUpdated":"2026-09-26T14:16:49.677","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100665","references":[{"url":"https://github.com/netty/netty/commit/09e72c4fd8007277121ed48db63a124b112b96fe","label":"disclosure@vulncheck.com"},{"url":"https://github.com/netty/netty/commit/994e887ed9","label":"disclosure@vulncheck.com"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-mj35-3qqm-q387","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/netty-4.2.11-through-4.2.17-quic-hostname-verification-bypass","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-26T13:33:20.915Z","slug":"CVE-2026-100665","body":"## Overview\n\nNetty 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}