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    CVE-2025-5399

    Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application.

    Published:Jun 7, 2025
    Last Modified:Jul 30, 2025
    EPS:Jun 7, 2025
    EPSS Score:0.0005
    CVSS Score:7.5

    Affected Products

    Vendor
    Curl
    Product
    Curl
    Vendor
    Curl
    Product
    Libcurl
    Vendor
    Haxx
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3168039

    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