ALPINE-CVE-2026-19445

ALPINE-CVE-2026-19445

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns a different context to SSLSocket.context (the documented way to select a certificate per server name) and nothing else keeps the original ssl.SSLContext alive. Typical cases are servers that create an SSLContext per connection or replace it while connections are open; servers that wrap their listening socket with it are not affected. Mitigation: keep a reference to every SSLContext that sets sni_callback for the lifetime of the server. TLS clients are not affected.

CVSS 9.2 · Critical · Fix available

Published

2026-09-30T17:16:45.720Z

Updated

2026-10-01T15:30:03.580546857Z

Stack: system

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