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CVE-2026-9277

Estado: AplazadaCrítica (9.2)—

shell-quote's `quote()` function did not validate object-token inputs against the operator model used by `parse()`. The `.op` field was backslash-escaped character by character using `/(.)/g`, which in JavaScript does not match line terminators (\n, \r, U+2028, U+2029). A line terminator in `.op` therefore passed through unescaped into the output; POSIX shells treat a literal newline as a command separator, so any content after it would execute as a second command.

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The vulnerable code path is reachable in two ways: (1) direct construction of `{ op: '...\n...' }` from external input, and (2) via `parse(cmd, envFn)` when `envFn` returns object tokens whose `.op` is attacker-influenced. Both are documented API surface. Fixed by replacing the per-character escape with strict shape validation: `.op` must match the parser's control-operator allowlist; `{ op: 'glob', pattern }` validates `pattern` and forbids line terminators; `{ comment }` validates `comment` and forbids line terminators; any other object shape throws `TypeError`.

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.

Vulnerabilidad de inyección de comando en librería Node.js accesible remotamente (AV:N, PR:N). Atacante manipula campo `.op` para inyectar newlines que se interpretan como separadores de comandos en shells POSIX, permitiendo ejecución arbitraria de código. CWE-77/78 confirman inyección de comandos.

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

Tecnologías afectadas (1)

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

CWE

Referencias

JSON original (NVD)

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  "published": "2026-05-22T14:16:30.330",
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  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
      "description": [
        {
          "lang": "en",
          "value": "CWE-77"
        },
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ]
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    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
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          "lang": "en",
          "value": "CWE-78"
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  "descriptions": [
    {
      "lang": "en",
      "value": "shell-quote's `quote()` function did not validate object-token inputs against the operator model used by `parse()`. The `.op` field was backslash-escaped character by character using `/(.)/g`, which in JavaScript does not match line terminators (\\n, \\r, U+2028, U+2029). A line terminator in `.op` therefore passed through unescaped into the output; POSIX shells treat a literal newline as a command separator, so any content after it would execute as a second command. The vulnerable code path is reachable in two ways: (1) direct construction of `{ op: '...\\n...' }` from external input, and (2) via `parse(cmd, envFn)` when `envFn` returns object tokens whose `.op` is attacker-influenced. Both are documented API surface. Fixed by replacing the per-character escape with strict shape validation: `.op` must match the parser's control-operator allowlist; `{ op: 'glob', pattern }` validates `pattern` and forbids line terminators; `{ comment }` validates `comment` and forbids line terminators; any other object shape throws `TypeError`."
    },
    {
      "lang": "es",
      "value": "La función 'quote()' de shell-quote no validaba las entradas de token de objeto contra el modelo de operador utilizado por 'parse()'. El campo '.op' se escapaba con barra invertida carácter por carácter usando '/(.)/g', lo que en JavaScript no coincide con los terminadores de línea ('\\n', '\\r', 'U+2028', 'U+2029'). Un terminador de línea en '.op' por lo tanto pasaba sin escapar a la salida; los shells POSIX tratan un salto de línea literal como un separador de comandos, por lo que cualquier contenido después de él se ejecutaría como un segundo comando. La ruta de código vulnerable es alcanzable de dos maneras: (1) construcción directa de '{ op: '...\\n...' }' desde entrada externa, y (2) a través de 'parse(cmd, envFn)' cuando 'envFn' devuelve tokens de objeto cuyo '.op' está influenciado por el atacante. Ambas son superficies de API documentadas. Solucionado reemplazando el escape por carácter con validación estricta de forma: '.op' debe coincidir con la lista de permitidos de operadores de control del analizador; '{ op: 'glob', pattern }' valida 'pattern' y prohíbe los terminadores de línea; '{ comment }' valida 'comment' y prohíbe los terminadores de línea; cualquier otra forma de objeto lanza 'TypeError'."
    }
  ],
  "lastModified": "2026-09-14T13:19:33.133",
  "sourceIdentifier": "7ffcee3d-2c14-4c3e-b844-86c6a321a158"
}