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    CVE-2026-8927

    When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.

    Published:Jul 3, 2026
    Last Modified:Jul 6, 2026
    EPS:Jul 3, 2026
    EPSS Score:0.0025
    CVSS Score:9.1

    Affected Products

    Vendor
    Curl
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3744543https://hackerone.com/reports/3744543

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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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