Cross-site Scripting (XSS) Affecting python3.14-freethreading-idle package, versions <0:3.14.5-1.el9_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.23% (14th percentile)

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  • Snyk IDSNYK-RHEL9-PYTHON314FREETHREADINGIDLE-17440580
  • published24 Jun 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

CVE-2026-6019  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade RHEL:9 python3.14-freethreading-idle to version 0:3.14.5-1.el9_8 or higher.
This issue was patched in RHSA-2026:28247.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.14-freethreading-idle package and not the python3.14-freethreading-idle package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.

CVSS Base Scores

version 3.1