Use After Free Affecting python3.12-idle package, versions <0:3.12.15-2.el8_10


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.43% (35th percentile)

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  • Snyk IDSNYK-RHEL8-PYTHON312IDLE-21043418
  • published16 Oct 2026
  • disclosed30 Sept 2026

Introduced: 30 Sep 2026

NewCVE-2026-19445  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade RHEL:8 python3.12-idle to version 0:3.12.15-2.el8_10 or higher.
This issue was patched in RHSA-2026:77028.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.12-idle package and not the python3.12-idle package as distributed by RHEL. See How to fix? for RHEL:8 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