Python SNI Zero-Length Extension Bug

5/10 Medium

Python 3 may send a zero-length server name extension (SNI), causing tlsv1 alert decode errors that break TLS connections.

PythonTLSSNI
Category
compatibility
Workaround
partial
Stage
deploy
Freshness
persistent
Scope
language
Upstream
open
Recurring
No
Buyer Type
team

Sources

Collection History

Query: “What are the most common pain points with SSL/TLS for developers in 2025?”4/9/2026

Python 3 might send a zero-length server name extension (SNI), causing tlsv1 alert decode error.

Created: 4/9/2026Updated: 4/9/2026