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    CVE-2026-12549

    The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.

    Published:Jun 22, 2026
    Last Modified:Jun 24, 2026
    EPS:Jun 22, 2026
    EPSS Score:0.00317
    CVSS Score:4.8

    Affected Products

    Vendor
    Libsoup
    Product
    Libsoup
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-100 Overflow Buffers
    CAPEC-256 SOAP Array Overflow

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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