Description

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.

INFO

Published Date :

2026-04-22T19:28:08.720Z

Last Modified :

2026-04-29T15:31:09.049Z

Source :

PSF
AFFECTED PRODUCTS

The following products are affected by CVE-2026-6019 vulnerability.

Vendors Products
Python
  • Cpython
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-6019.

URL Resource
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104 cve-icon cve-icon cve-icon
https://github.com/python/cpython/issues/90309 cve-icon cve-icon cve-icon
https://github.com/python/cpython/pull/148848 cve-icon cve-icon cve-icon
https://mail.python.org/archives/list/[email protected]/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/ cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-6019 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-6019 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact