CVE-2026-11940 Affecting python3-tkinter package, versions <0:3.9.25-1.amzn2023.0.8


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.73% (51st percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON3TKINTER-18063990
  • published21 Jul 2026
  • disclosed23 Jun 2026

Introduced: 23 Jun 2026

CVE-2026-11940  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-tkinter to version 0:3.9.25-1.amzn2023.0.8 or higher.
This issue was patched in ALAS2023-2026-1963.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-tkinter package and not the python3-tkinter package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself.  The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory.  This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.

CVSS Base Scores

version 3.1