UBUNTU-CVE-2026-106803

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    UBUNTU-CVE-2026-106803

    Published: 2 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-106803

    Summary:

    Details: A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger stack corruption and terminate the P-CSCF process, resulting in denial of service.

    References: https://ubuntu.com/security/CVE-2026-106803, https://www.cve.org/CVERecord?id=CVE-2026-106803, https://gist.github.com/hackeryounow/7d7ccc9ec501a5d8c9143b2e1bcc11cb, https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9, https://github.com/kamailio/kamailio/issues/4954, https://github.com/kamailio/kamailio/pull/4958

    Affected packages

    Package

    Name: kamailio

    Purl: pkg:deb/ubuntu/kamailio?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.3.1-2ubuntu1
    4.3.4-1.1ubuntu1
    4.3.4-1.1ubuntu2
    4.3.4-1.1ubuntu2.1
    4.3.4-1.1ubuntu2.1+esm1
    4.3.4-1.1ubuntu2.1+esm2

    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
    UBUNTU-CVE-2026-106803 | CVE-DB