{"cve":"CVE-2011-4815","nvd":{"published":"2011-12-30T01:55:01.437","modified":"2026-06-16T23:35:27.247","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html","http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/391606","http://jvn.jp/en/jp/JVN90615481/index.html","http://jvndb.jvn.jp/ja/contents/2012/JVNDB-2012-000066.html","http://lists.apple.com/archives/security-announce/2012/May/msg00001.html"],"products":["ruby-lang:ruby"],"source":"nvd","synced_at":"2026-10-19T19:59:31.623151214+00:00"},"epss":{"cve":"CVE-2011-4815","score":0.04059,"percentile":0.90659,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}