Improper Encoding or Escaping of Output Affecting python-3.13 package, versions <3.13.13-r3


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.23% (14th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-PYTHON313-16542094
  • published9 May 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

CVE-2026-6019  (opens in a new tab)
CWE-116  (opens in a new tab)

How to fix?

Upgrade Chainguard python-3.13 to version 3.13.13-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-3.13 package and not the python-3.13 package as distributed by Chainguard. See How to fix? for Chainguard 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