CVE-2026-19445 Affecting libpython3_12-1_0 package, versions <3.12.15-150600.3.71.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.43% (35th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-SLES156-LIBPYTHON31210-20956100
  • published15 Oct 2026
  • disclosed14 Oct 2026

Introduced: 14 Oct 2026

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

How to fix?

Upgrade SLES:15.6 libpython3_12-1_0 to version 3.12.15-150600.3.71.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libpython3_12-1_0 package and not the libpython3_12-1_0 package as distributed by SLES. See How to fix? for SLES:15.6 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