CVE-2026-41292

Estado: ModificadaMedia (6.6)—
NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:Red
Puntuación base: 6.6
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.83%
Percentil entre todas las CVEs puntuadas: 56
Fecha de la puntuación: 5/10/2026
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)

Nlnetlabs — Unbound
CWE

CWE-407, CWE-770
CWE-1050
Referencias

JSON original (NVD)

Mostrar
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            },
            {
              "automatable": "yes"
            },
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          "version": "2.0.3",
          "timestamp": "2026-05-20T12:11:12.511786Z"
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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          "integrityRequirement": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "published": "2026-05-20T10:16:27.327",
  "references": [
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      "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "sep@nlnetlabs.nl",
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        },
        {
          "lang": "en",
          "value": "CWE-770"
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    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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    {
      "lang": "en",
      "value": "NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100)."
    },
    {
      "lang": "es",
      "value": "NLnet Labs Unbound hasta e incluyendo la versión 1.25.0 es vulnerable a un ataque de degradación de servicio relacionado con el análisis de largas listas de opciones EDNS entrantes. Un adversario que envíe consultas con demasiadas opciones EDNS puede mantener los hilos de Unbound como rehenes mientras estos analizan y crean estructuras de datos internas para las opciones. Los ataques coordinados pueden resultar en degradación y/o denegación de servicio. Unbound 1.25.1 contiene un parche con una solución para limitar las opciones EDNS entrantes aceptables (100)."
    }
  ],
  "lastModified": "2026-08-26T13:18:46.237",
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