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CVE-2026-45149

Estado: AnalizadaAlta (7.5)—

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6.

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.

Acceso de red sin autenticación (AV:N/PR:N) sobre biblioteca expuesta; DoS por consumo masivo de memoria (505 MB) en generación de rangos numéricos sin límite previo.

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)

Juliangruber — Brace-expansion

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-45149",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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            {
              "automatable": "no"
            },
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              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-06-01T16:42:12.730782Z"
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          "integrityImpact": "NONE",
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          "availabilityImpact": "HIGH",
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  "published": "2026-05-29T20:16:25.550",
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      "url": "https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-jxxr-4gwj-5jf2",
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      "description": [
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          "value": "CWE-400"
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      "value": "The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6."
    },
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      "lang": "es",
      "value": "La biblioteca brace-expansion genera cadenas arbitrarias que contienen un prefijo y un sufijo comunes. Desde la versión 5.0.0 hasta antes de la 5.0.6, la opción max se estaba aplicando demasiado tarde. Al expandir un único rango numérico grande como {1..10000000}, el bucle de generación de secuencia genera los 10 millones de elementos intermedios antes de que se aplique el límite max. Con max=10, la salida se limita correctamente a 10 elementos, pero el proceso sigue asignando ~505 MB y gasta ~800ms en construir el array intermedio completo. Esta vulnerabilidad se corrige en la versión 5.0.6."
    }
  ],
  "lastModified": "2026-07-22T06:10:00.170",
  "configurations": [
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