{"id":"CVE-2011-4815","aliases":["DLA-88-1","EUVD-2011-4733","GHSA-xpr8-vpc7-7vfc","RHSA-2012:0069","RHSA-2012:0070","RHSA-2026:7305","RHSA-2026:7307","RHSA-2026:8838"],"status":"published","title":"Ruby (aka CRuby) before 1.8.7-p357 computes hash values without restricting the ability to...","description":"Ruby (aka CRuby) before 1.8.7-p357 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.","severity":{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.04059,"percentile":0.90728,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2011-12-30T01:00:00Z","modified":"2026-10-06T10:31:19Z","fixes":[{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ruby","fixed_in":["0:1.8.7.352-4.el6_2"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ruby-debuginfo","fixed_in":["0:1.8.7.352-4.el6_2"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ruby-irb","fixed_in":["0:1.8.7.352-4.el6_2"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ruby-libs","fixed_in":["0:1.8.7.352-4.el6_2"],"sources":["osv"]},{"ecosystem":"Red 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