CVE-2008-3656

Estado: ModificadaAlta (7.8)—
Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular expression.
CVSS

Versión: 2.0
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Puntuación base: 7.8
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 70%
Percentil entre todas las CVEs puntuadas: 99
Fecha de la puntuación: 6/10/2026
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 (1)

Ruby-lang — Ruby
CWE

CWE-399
Referencias

JSON original (NVD)

Mostrar
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              "matchCriteriaId": "1FE05F3A-A8B5-45EE-BF52-D55E2768F890"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.8.7:p71:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0C6D66E2-3E10-4DEA-9E6B-53A5DE78AFCF"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.8.7:preview1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4E37786B-5336-4182-A1E3-801BDB6F61EC"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.8.7:preview2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "349D014E-223A-46A7-8334-543DB330C215"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.8.7:preview3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "550EC183-43A1-4A63-A23C-A48C1F078451"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.8.7:preview4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0ACECF59-AA88-4B5C-A671-83842C9CF072"
            },
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:1.9.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "52179EC7-CAF0-42AA-A21A-7105E10CA122"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}