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    CVE-2026-124249

    http.cookiejar.CookieJar deleted a stored cookie when a response carried an already expired Set-Cookie header for it, using the Domain and Path attributes from the header without consulting the cookie policy. A server could therefore delete cookies belonging to other domains from a shared cookie jar, such as the one used by urllib's HTTPCookieProcessor. The fix consults the cookie policy before an expired cookie may delete an existing one, as required by RFC 6265 section 5.3.

    Published:Nov 9, 2026
    Last Modified:Nov 10, 2026
    EPS:Nov 9, 2026
    EPSS Score:
    CVSS Score:6.3

    Affected Products

    Vendor
    Python
    Product
    Cpython
    Vendor
    Python Software Foundation
    Product
    Cpython

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-346 Origin Validation Error

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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
    CVE-2026-124249 — Python, Python_Software_Foundation (Medium… | CVE-DB