{"schemaVersion":3,"id":"CVE-2026-19445","aliases":["ALPINE-CVE-2026-19445","RHSA-2026:74867","UBUNTU-CVE-2026-19445","DEBIAN-CVE-2026-19445"],"status":"published","duplicateOf":null,"title":null,"description":"A remote, unauthenticated TLS client can make a server crash or call\nthrough a freed pointer if its sni_callback assigns a different context to\nSSLSocket.context (the documented way to select a certificate per server\nname) and nothing else keeps the original ssl.SSLContext alive. Typical\ncases are servers that create an SSLContext per connection or replace it\nwhile connections are open; servers that wrap their listening socket with\nit are not affected.\n\n\nMitigation: keep a reference to every SSLContext that sets sni_callback for\nthe lifetime of the server. 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