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CVE-2026-41401

Estado: AplazadaAlta (7.1)—

libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.

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.

AV:N/PR:L requiere red + privilegios, sugiriendo T1210. CWE-416 (use-after-free) causa DoS (crash) primariamente, con potencial de ejecución remota secundaria en contextos YANG XML.

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

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

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

Cesnet — LibyangAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-41401",
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          "options": [
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          "version": "2.0.3",
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    "cvssMetricV31": [
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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      "description": [
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      "lang": "en",
      "value": "libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution."
    },
    {
      "lang": "es",
      "value": "libyang anterior a la versión 5.2.6 contiene una vulnerabilidad de escritura de uso después de liberación en el heap en lyd_parser_set_data_flags que actualiza incorrectamente los punteros de la lista de metadatos al liberar entradas de metadatos predeterminadas no principales. Los atacantes pueden desencadenar esta vulnerabilidad al enviar documentos XML YANG especialmente diseñados con atributos de metadatos específicos a aplicaciones que analizan datos XML no confiables, causando caídas del proceso o una posible ejecución de código."
    }
  ],
  "lastModified": "2026-07-24T11:10:00.170",
  "sourceIdentifier": "disclosure@vulncheck.com"
}