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    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.

    Published:Apr 22, 2026
    Last Modified:May 28, 2026
    EPS:Apr 22, 2026
    EPSS Score:0.00031
    CVSS Score:6.1

    Affected Products

    Vendor
    Python
    Product
    Cpython
    Vendor
    Python
    Product
    Python

    Exploits

    https://github.com/python/cpython/issues/90309

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High