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    CVE-2026-3099

    A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.

    Published:Feb 24, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 12, 2026
    EPSS Score:0.00395
    CVSS Score:5.8

    Affected Products

    Vendor
    Gnome
    Product
    Libsoup
    Vendor
    Libsoup
    Product
    Libsoup
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://gitlab.gnome.org/GNOME/libsoup/-/issues/495

    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