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CVE-2026-39864

Estado: AnalizadaMedia (4.9)—

Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Kamailio — Kamailio

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-39864",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-39864",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-08T20:19:26.241924Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 0.7
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 1.2
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      "source": "security-advisories@github.com",
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          "vendor": "kamailio",
          "product": "kamailio",
          "versions": [
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              "status": "affected",
              "version": "< 5.8.7"
            },
            {
              "status": "affected",
              "version": ">= 6.0.0, < 6.0.5"
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  "published": "2026-04-08T20:16:26.700",
  "references": [
    {
      "url": "https://github.com/kamailio/kamailio/security/advisories/GHSA-6m86-m342-g48m",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7."
    },
    {
      "lang": "es",
      "value": "Kamailio es una implementación de código abierto de un servidor de señalización SIP. Antes de 6.0.5 y 5.8.7, una lectura fuera de límites en el módulo auth de Kamailio (anteriormente OpenSER y SER) permite a atacantes remotos causar una denegación de servicio (caída del proceso) a través de un paquete SIP especialmente diseñado si una autenticación de usuario exitosa sin un backend de base de datos es seguida por comprobaciones adicionales de identidad de usuario. Esta vulnerabilidad se corrige en 6.0.5 y 5.8.7."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "5.8.7"
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              "versionEndExcluding": "6.0.5",
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}