CVE-2026-19445 Affecting python3.12-test package, versions <0:3.12.15-1.el9_8


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.43% (35th percentile)

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  • Snyk IDSNYK-ALMALINUX9-PYTHON312TEST-20729595
  • published10 Oct 2026
  • disclosed6 Oct 2026

Introduced: 6 Oct 2026

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

How to fix?

Upgrade AlmaLinux:9 python3.12-test to version 0:3.12.15-1.el9_8 or higher.
This issue was patched in ALSA-2026:77017.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.12-test package and not the python3.12-test package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 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