CVE-2026-24401

{
  "id": "CVE-2026-24401",
  "sourceIdentifier": "[email protected]",
  "published": "2026-01-24T02:15:48.760",
  "lastModified": "2026-10-23T16:16:51.507",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \"h.local\" as a CNAME for \"h.local\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524, which is part of version 0.9-rc3."
    },
    {
      "lang": "es",
      "value": "Avahi es un sistema que facilita el descubrimiento de servicios en una red local a través de la suite de protocolos mDNS/DNS-SD. En las versiones 0.9rc2 e inferiores, avahi-daemon puede ser bloqueado mediante un fallo de segmentación al enviar una respuesta mDNS no solicitada que contenga un registro CNAME recursivo, donde el alias y el nombre canónico apuntan al mismo dominio (por ejemplo, 'h.local' como CNAME para 'h.local'). Esto causa una recursión ilimitada en la función lookup_handle_cname, lo que lleva al agotamiento de la pila. La vulnerabilidad afecta a los navegadores de registros donde AVAHI_LOOKUP_USE_MULTICAST está configurado explícitamente, lo que incluye los navegadores de registros creados por los resolvedores utilizados por nss-mdns. Este problema está parcheado en el commit 78eab31128479f06e30beb8c1cbf99dd921e2524."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "avahi",
          "product": "avahi",
          "versions": [
            {
              "version": "< 0.9-rc3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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      {
        "source": "[email protected]",
        "type": "Secondary",
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          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
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          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-01-26T16:14:24.982686Z",
          "id": "CVE-2026-24401",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
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          "role": "CISA Coordinator",
          "version": "2.0.3"
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-674"
        }
      ]
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  "configurations": [
    {
      "nodes": [
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  "references": [
    {
      "url": "https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524",
      "source": "[email protected]",
      "tags": [
        "Patch"
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    },
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      "url": "https://github.com/avahi/avahi/issues/501",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}