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CVE-2018-1000005

Estado: ModificadaCrítica (9.1)—

libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly.

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When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.

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).

Tecnologías afectadas (3)

Canonical — Ubuntu LinuxDebian — Debian LinuxHaxx — Libcurl

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2018-1000005",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "impactScore": 4.9,
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          "attackComplexity": "LOW",
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  "published": "2018-01-24T22:29:00.307",
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          "value": "CWE-125"
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      "value": "libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something."
    },
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      "value": "libcurl 7.49.0 hasta e incluyendo la versión 7.57.0 contiene una lectura fuera de límites en los trailers de manipulación de código HTTP/2. Se ha notificado (https://github.com/curl/curl/pull/2231) que la lectura de un trailer HTTP/2 podría dañar futuros trailers debido a que el tamaño almacenado era un byte menor de lo requerido. El problema es que el código que crea cabeceras como HTTP/1 de los datos del trailer HTTP/2 anexaron una cadena como \":\" en el búfer objetivo, a pesar de que se había cambiado recientemente a \": \" (se añadió un espacio después de los dos puntos), pero la siguiente matemática no se actualizó debidamente. Al acceder a ellos, los datos se leen fuera de límites y provocan o un cierre inesperado o que los datos (demasiado grandes) se pasen a escritura del cliente. Esto podría conducir a una situación de denegación de servicio (DoS) o a una divulgación de información si alguien tiene un servicio que devuelva ecos o que emplee los trailers para algo."
    }
  ],
  "lastModified": "2026-06-17T01:32:11.433",
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