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CVE-2026-58218

Estado: Pendiente de análisisMedia (5.3)—

A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Samba — SambaAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-58218",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-58218",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-30T17:34:52.210830Z"
        }
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    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "secalert@redhat.com",
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          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
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      "affectedData": [
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          "defaultStatus": "unknown"
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          "cpes": [
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  "published": "2026-07-30T14:17:00.307",
  "references": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-58218",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502728",
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    {
      "url": "https://bugzilla.samba.org/show_bug.cgi?id=16115",
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  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-410"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service."
    }
  ],
  "lastModified": "2026-07-30T19:18:26.480",
  "sourceIdentifier": "secalert@redhat.com"
}