CVE-2026-1678

{
  "id": "CVE-2026-1678",
  "sourceIdentifier": "[email protected]",
  "published": "2026-03-05T07:16:11.437",
  "lastModified": "2026-11-05T19:31:14.457",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "dns_unpack_name() caches the buffer tailroom once and reuses it while appending DNS labels. As the buffer grows, the cached size becomes incorrect, and the final null terminator can be written past the buffer. With assertions disabled (default), a malicious DNS response can trigger an out-of-bounds write when CONFIG_DNS_RESOLVER is enabled."
    },
    {
      "lang": "es",
      "value": "dns_unpack_name() almacena en caché el espacio restante del búfer una vez y lo reutiliza al adjuntar etiquetas DNS. A medida que el búfer crece, el tamaño almacenado en caché se vuelve incorrecto, y el terminador nulo final puede escribirse más allá del búfer. Con las aserciones deshabilitadas (por defecto), una respuesta DNS maliciosa puede desencadenar una escritura fuera de los límites cuando CONFIG_DNS_RESOLVER está habilitado."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject-rtos",
          "product": "Zephyr",
          "defaultStatus": "unaffected",
          "packageName": "Zephyr",
          "repo": "https://github.com/zephyrproject-rtos/zephyr",
          "versions": [
            {
              "version": "*",
              "lessThan": "3.7.2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4.0.0",
              "lessThan": "4.2.2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4.3.0",
              "lessThan": "4.3.1",
              "versionType": "git",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.5
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-03-05T15:27:59.030104Z",
          "id": "CVE-2026-1678",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "3.7.2",
              "matchCriteriaId": "3B784720-9361-4705-A8DE-269DF5087A60"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.0.0",
              "versionEndExcluding": "4.2.2",
              "matchCriteriaId": "DD5EC1AE-C641-49D6-996D-FAEB2A2B1389"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.3.0",
              "versionEndExcluding": "4.3.1",
              "matchCriteriaId": "21F51048-6FFD-4048-BC51-4DB65A0ADC30"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}