CVE-2026-19445 Affecting python3.14 package, versions <3.14.8-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.52% (45th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-PYTHON314-20341725
  • published1 Oct 2026
  • disclosed30 Sept 2026

Introduced: 30 Sep 2026

NewCVE-2026-19445  (opens in a new tab)

How to fix?

Upgrade Debian:unstable python3.14 to version 3.14.8-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.14 package and not the python3.14 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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 Base Scores

version 3.1