{"id":"CVE-2011-4838","aliases":["DEBIAN-CVE-2011-4838","DLA-209-1","EUVD-2011-4756","GHSA-cgqc-fqxr-q6r6"],"status":"published","title":"JRuby before 1.6.5.1 computes hash values without restricting the ability to trigger hash...","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.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.04203,"percentile":0.91026,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2011-12-30T01:00:00Z","modified":"2026-10-23T17:47:36Z","fixes":[{"ecosystem":"Debian:12","package":"jruby","fixed_in":["1.5.6-4"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"jruby","fixed_in":["1.5.6-4"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"jruby","fixed_in":["1.5.6-4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-4"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-4"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-4"}]}]},{"source":"osv","ecosystem":"Debian:6.0","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.1-1+deb6u1"}]}],"versions":["1.3.1-2","1.4.0-1","1.4.0-2","1.5.0~rc1-1","1.5.0~rc3-1","1.5.1-1"],"bundled":2}],"products":[{"vendor":"jruby","product":"jruby"}],"references":[{"url":"http://www.nruns.com/_downloads/advisory28122011.pdf","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/72019","tags":["vdb-entry","x_refsource_XF","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"http://jruby.org/2011/12/27/jruby-1-6-5-1.html","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"http://secunia.com/advisories/50084","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Third Party Advisory","advisory"]},{"url":"http://secunia.com/advisories/47407","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.kb.cert.org/vuls/id/903934","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","Third Party Advisory","US Government Resource","advisory","web"]},{"url":"http://rhn.redhat.com/errata/RHSA-2012-1232.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","Broken Link","advisory"]},{"url":"http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Broken Link","web"]},{"url":"http://security.gentoo.org/glsa/glsa-201207-06.xml","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.ocert.org/advisories/ocert-2011-003.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4838"},{"url":"https://github.com/advisories/GHSA-cgqc-fqxr-q6r6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-4838","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-4838","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.","status":"published","published":"2011-12-30T01:00:00Z","modified":"2024-08-07T00:16:34.943Z","updated_at":"2026-11-02T14:35:37.671707Z"}],"euvd":[{"id":"EUVD-2011-4756","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.","status":"published","published":"2011-12-30T01:00:00Z","modified":"2024-08-07T00:16:34Z","updated_at":"2026-11-03T01:39:48.106738Z"}],"ghsa":[{"id":"GHSA-cgqc-fqxr-q6r6","title":"JRuby before 1.6.5.1 computes hash values without restricting the ability to trigger hash...","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.","status":"published","published":"2022-05-13T01:12:13Z","modified":"2023-02-01T05:03:56Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:50:07.322817Z"}],"nvd":[{"id":"CVE-2011-4838","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.","status":"published","published":"2011-12-30T01:55:01.5Z","modified":"2026-06-16T23:35:29.917Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:02:11.800512Z"}],"osv":[{"id":"CVE-2011-4838","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.","status":"published","published":"2011-12-30T01:55:01Z","modified":"2026-04-10T03:43:08.773464Z","updated_at":"2026-11-02T15:43:58.279353Z"},{"id":"DEBIAN-CVE-2011-4838","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.","status":"published","published":"2011-12-30T01:55:01.5Z","modified":"2026-10-23T17:47:36.860544586Z","updated_at":"2026-11-02T15:45:24.612044Z"},{"id":"DLA-209-1","title":"jruby - security update","status":"published","published":"2015-04-29T00:00:00Z","modified":"2026-03-09T01:17:50.545178Z","updated_at":"2026-11-02T15:46:10.227108Z"}]}}