Vulnerability DatabaseCVE-2026-6019
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CVE-2026-6019
Published:April 22, 2026
Updated:May 18, 2026
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.
Affected Packages
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=legacy-trunk <76b3923d688c0efc580658476c5f525ec8735104
Fix Suggestion:
Update to version 76b3923d688c0efc580658476c5f525ec8735104
Related Resources (6)
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
https://github.com/python/cpython/pull/148848
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
https://github.com/python/cpython/issues/90309
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CVSS v4
Base Score:
2.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Escape, Meta, or Control Sequences
CWE-150
Improper Encoding or Escaping of Output
CWE-116
EPSS
Base Score:
0.06