CVE-2026-6019

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-6019
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.

6.1 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c Patch
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104 Patch
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8 Patch
https://github.com/python/cpython/issues/90309 Exploit Issue Tracking
https://github.com/python/cpython/pull/148848 Issue Tracking Patch
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/ Mailing List Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha8:*:*:*:*:*:*
History

26 Oct 2026, 21:10

Type Values Removed Values Added
Summary
  • (es) http.cookies.Morsel.js_output() devuelve un fragmento de [script_tag] en línea y solo escapa ” para el contexto de cadena de JavaScript. No neutraliza la secuencia sensible al analizador HTML [/script] dentro del elemento de script generado. La mitigación codifica en base64 el valor de la cookie para impedir el escape utilizando el valor de la cookie.
Information

Published : 2026-04-22 20:16

Updated : 2026-10-26 21:10

NVD link : CVE-2026-6019

Mitre link : CVE-2026-6019

CVE.ORG link : CVE-2026-6019

JSON object : View

Products Affected

python

  • python
CWE
CWE-150

Improper Neutralization of Escape, Meta, or Control Sequences

CWE-116

Improper Encoding or Escaping of Output