Behavioral Change in New Version or Environment Affecting python3.13-freethreading package, versions <0:3.13.15-1.1.hum1


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.73% (53rd 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-RHEL10-PYTHON313FREETHREADING-21150506
  • published17 Oct 2026
  • disclosed18 Aug 2026

Introduced: 18 Aug 2026

CVE-2026-17084  (opens in a new tab)
CWE-439  (opens in a new tab)

How to fix?

Upgrade RHEL:10 python3.13-freethreading to version 0:3.13.15-1.1.hum1 or higher.
This issue was patched in RHSA-2026:65567.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.13-freethreading package and not the python3.13-freethreading package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.

CVSS Base Scores

version 3.1