CVE-2026-19445 Affecting python313 package, versions <3.13.16-150700.4.61.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.52% (45th percentile)

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  • Snyk IDSNYK-SLES157-PYTHON313-21876127
  • published30 Oct 2026
  • disclosed29 Oct 2026

Introduced: 29 Oct 2026

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

How to fix?

Upgrade SLES:15.7 python313 to version 3.13.16-150700.4.61.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python313 package and not the python313 package as distributed by SLES. See How to fix? for SLES:15.7 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