CVE-2011-4838

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    CVE-2011-4838

    Published: 30 Dec 2011Last Modified: 10 Apr 2026

    Summary:

    Details: 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.

    References: 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, http://security.gentoo.org/glsa/glsa-201207-06.xml, http://www.kb.cert.org/vuls/id/903934, http://www.nruns.com/_downloads/advisory28122011.pdf, http://www.ocert.org/advisories/ocert-2011-003.html, https://exchange.xforce.ibmcloud.com/vulnerabilities/72019, http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html, http://www.kb.cert.org/vuls/id/903934

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High