CRLF Injection Affecting python3-tkinter package, versions <0:3.9.25-1.amzn2023.0.4


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (17th 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 Learn

Learn about CRLF Injection vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-AMZN2023-PYTHON3TKINTER-16067722
  • published15 Apr 2026
  • disclosed23 Jan 2026

Introduced: 23 Jan 2026

CVE-2026-1299  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-tkinter to version 0:3.9.25-1.amzn2023.0.4 or higher.
This issue was patched in ALAS2023-2026-1583.

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.

The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".

CVSS Base Scores

version 3.1