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algor\u00edtmica en la funci\u00f3n WEBrick::HTTPUtils.split_header_value en WEBrick::HTTP::DefaultFileHandler en WEBrick en Ruby versiones 1.8.5 y anteriores, versiones 1.8.6 hasta 1.8.6-p286, versiones 1.8.7 hasta 1.8.7-p71, y versiones 1.9 hasta r18423, permite a los atacantes dependiendo del contexto causar una denegaci\u00f3n de servicio (consumo de CPU) por medio de una petici\u00f3n HTTP dise\u00f1ada que se procesa mediante una expresi\u00f3n regular backtracking."}], "id": "CVE-2008-3656", "lastModified": "2026-04-23T00:35:47.467", "metrics": {"cvssMetricV2": [{"acInsufInfo": true, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.8, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, 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{"affected_release": [{"advisory": "RHSA-2008:0897", "cpe": "cpe:/o:redhat:enterprise_linux:4", "package": "ruby-0:1.8.1-7.el4_7.1", "product_name": "Red Hat Enterprise Linux 4", "release_date": "2008-10-21T00:00:00Z"}, {"advisory": "RHSA-2008:0897", "cpe": "cpe:/o:redhat:enterprise_linux:5", "package": "ruby-0:1.8.5-5.el5_2.5", "product_name": "Red Hat Enterprise Linux 5", "release_date": "2008-10-21T00:00:00Z"}], "bugzilla": {"description": "ruby: WEBrick DoS vulnerability (CPU consumption)", "id": "458953", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=458953"}, "csaw": false, "details": ["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."], "name": "CVE-2008-3656", "public_date": "2008-08-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2008-3656\nhttps://nvd.nist.gov/vuln/detail/CVE-2008-3656"], "threat_severity": "Moderate"}

{}