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CVE-2026-100890

Estado: Pendiente de análisisMedia (5.5)—

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector AV:N sin PR/UI permite ataque remoto sin privilegios contra aplicación expuesta (T1190). CWE-476 (null pointer dereference) causa DoS en servidor de correo (T1499.004). SPF Parser manipulable remotamente.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

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

Trusteddomain — OpendmarcAI

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-100890",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-100890",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
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              "automatable": "yes"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-09-28T12:55:04.151218Z"
        }
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    "cvssMetricV2": [
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
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      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
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        "cvssData": {
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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          "Safety": "NOT_DEFINED",
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          "Recovery": "NOT_DEFINED",
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          "Automatable": "NOT_DEFINED",
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          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "PROOF_OF_CONCEPT",
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          "modifiedAttackRequirements": "NOT_DEFINED",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  },
  "affected": [
    {
      "source": "cna@vuldb.com",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*"
          ],
          "vendor": "Trusted Domain Project",
          "modules": [
            "SPF Parser"
          ],
          "product": "OpenDMARC",
          "versions": [
            {
              "status": "affected",
              "version": "1.4.0"
            },
            {
              "status": "affected",
              "version": "1.4.1"
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            {
              "status": "affected",
              "version": "1.4.2"
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      ]
    }
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  "published": "2026-09-28T01:16:28.047",
  "references": [
    {
      "url": "https://vuldb.com/cve/CVE-2026-100890",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/submit/917188",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/vuln/410840",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/vuln/410840/cti",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://weitongli.com/share/opendmarc-ip6-wild-pointer.html",
      "source": "cna@vuldb.com"
    }
  ],
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    {
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      "source": "cna@vuldb.com",
      "description": [
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          "lang": "en",
          "value": "CWE-404"
        },
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way."
    }
  ],
  "lastModified": "2026-09-28T15:15:33.930",
  "sourceIdentifier": "cna@vuldb.com"
}