CVE-2026-19445

01/תיאור (מקור, אנגלית)

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.

02/קישורים10

• github.com/python/cpython/commit/34a53dce8174da2fceb12fe084a4d‮…
• github.com/python/cpython/commit/46133cd57d309652139ada74014ac‮…
• github.com/python/cpython/commit/63fab143d94cafae71850831acfb5‮…
• github.com/python/cpython/commit/b12968cefe69ca1dcb8606c832ff7‮…
• github.com/python/cpython/commit/cd7e51e7d4563866fbaa1e2521ae6‮…
• github.com/python/cpython/commit/d8717ed01717a9641686e6e6f83f0‮…
• github.com/python/cpython/commit/ec44b5a3258cbda947d5e07242ee5‮…
• github.com/python/cpython/issues/156293
• github.com/python/cpython/pull/158504
• mail.python.org/archives/list/[email protected]/thr‮…