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    CVE-2026-39863

    Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.1.1, 6.0.6, and 5.8.8, an out-of-bounds access in the core of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted data packet sent over TCP. The issue impacts Kamailio instances having TCP or TLS listeners. This vulnerability is fixed in 5.1.1, 6.0.6, and 5.8.8.

    Published:Apr 8, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 8, 2026
    EPSS Score:0.00139
    CVSS Score:7.5

    Affected Products

    Vendor
    Kamailio
    Product
    Kamailio

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-52023 (CVSS 7.5) — An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the ims_regi…
    CVE-2026-52022 (CVSS 7.5) — An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the IMS P-CS…
    CVE-2026-82608 (CVSS 2.1) — A vulnerability was determined in Kamailio up to 5.5.0/6.0.7. This affects the function get_4bytes of the file…
    CVE-2026-39864 (CVSS 4.4) — Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bound…
    CVE-2025-12207 (CVSS 1.9) — A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.…
    CVE-2025-12206 (CVSS 1.9) — A flaw has been found in Kamailio 5.5. The impacted element is the function rve_is_constant of the file src/co…
    CVE-2025-12205 (CVSS 1.9) — A vulnerability was detected in Kamailio 5.5. The affected element is the function sr_push_yy_state of the fil…
    CVE-2025-12204 (CVSS 1.9) — A security vulnerability has been detected in Kamailio 5.5. Impacted is the function rve_destroy of the file s…
    CVE-2020-27507 (CVSS 9.8) — The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, lea…
    CVE-2020-28361 (CVSS 5.4) — Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other produ…

    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