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CVE-2026-27601

Estado: AnalizadaAlta (8.2)—

Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual.

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In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8.

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.

Red sin autenticación (AV:N/PR:N) explotando recursión sin límite en _.flatten/_.isEqual para DoS por desbordamiento de pila; CWE-770 (asignación sin límite).

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Underscorejs — Underscore

CWE

Referencias

JSON original (NVD)

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      "value": "Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8."
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      "value": "Underscore.js es una librería de utilidades para JavaScript. Antes de la versión 1.13.8, las funciones _.flatten y _.isEqual usan recursión sin un límite de profundidad. Bajo condiciones muy específicas, detalladas a continuación, un atacante podría explotar esto en un ataque de denegación de servicio (DoS) al desencadenar un desbordamiento de pila. Se debe usar entrada no confiable para crear una estructura de datos recursiva, por ejemplo, usando JSON.parse, sin un límite de profundidad impuesto. La estructura de datos así creada debe pasarse a _.flatten o _.isEqual. En el caso de _.flatten, la vulnerabilidad solo puede ser explotada si es posible para un cliente remoto preparar una estructura de datos que consista en arrays en todos los niveles Y si no se pasa un límite de profundidad finito como segundo argumento a _.flatten. En el caso de _.isEqual, la vulnerabilidad solo puede ser explotada si existe una ruta de código en la que dos estructuras de datos distintas que fueron enviadas por el mismo cliente remoto se comparan usando _.isEqual. Por ejemplo, si un cliente envía datos que se almacenan en una base de datos, y el mismo cliente puede luego enviar otra estructura de datos que luego se compara con los datos que se guardaron en la base de datos previamente, O si un cliente envía una única solicitud, pero sus datos se analizan dos veces, creando dos estructuras de datos no idénticas pero equivalentes que luego se comparan. Las excepciones que se originan de la llamada a _.flatten o _.isEqual, como resultado de un desbordamiento de pila, no están siendo capturadas. Esta vulnerabilidad está corregida en la versión 1.13.8."
    }
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  "lastModified": "2026-06-17T10:27:22.407",
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