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CVE-2026-24401

Estado: AnalizadaMedia (6.5)—

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.

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)

Avahi — Avahi

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-24401",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-24401",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-26T16:14:24.982686Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "avahi",
          "product": "avahi",
          "versions": [
            {
              "status": "affected",
              "version": "< 78eab31128479f06e30beb8c1cbf99dd921e2524"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-01-24T02:15:48.760",
  "references": [
    {
      "url": "https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/avahi/avahi/issues/501",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-674"
        }
      ]
    }
  ],
  "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."
    },
    {
      "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."
    }
  ],
  "lastModified": "2026-06-17T10:23:00.687",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6481267F-934F-4A0C-9B25-59738E798458",
              "versionEndExcluding": "0.9"
            },
            {
              "criteria": "cpe:2.3:a:avahi:avahi:0.9:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "76971590-AEED-4CB1-B7B7-45EA8FD11524"
            },
            {
              "criteria": "cpe:2.3:a:avahi:avahi:0.9:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "83D94AE4-46AC-4955-BB0D-193CF79149A1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}