{"cve":"CVE-2011-4838","nvd":{"published":"2011-12-30T01:55:01.500","modified":"2026-06-16T23:35:29.917","status":"Modified","description":"JRuby before 1.6.5.1 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-400"],"references":["http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html","http://jruby.org/2011/12/27/jruby-1-6-5-1.html","http://rhn.redhat.com/errata/RHSA-2012-1232.html","http://secunia.com/advisories/47407","http://secunia.com/advisories/50084"],"products":["jruby:jruby"],"source":"nvd","synced_at":"2026-10-19T19:59:31.623151214+00:00"},"epss":{"cve":"CVE-2011-4838","score":0.04203,"percentile":0.90964,"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."]}