CVE-2011-4838
MEDIUM · CVSS 5.0EPSS 4.2%EU EUVD
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.
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P- Weakness (CWE)
- CWE-400
- EPSS score
- 4.2% (91th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-4756)
- Published
- December 30, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-4756 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- jruby / jruby
References
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html(Broken Link)
- http://jruby.org/2011/12/27/jruby-1-6-5-1.html(Vendor Advisory)
- http://rhn.redhat.com/errata/RHSA-2012-1232.html(Broken Link)
- http://secunia.com/advisories/47407(Third Party Advisory)
- http://secunia.com/advisories/50084(Third Party Advisory)
- http://security.gentoo.org/glsa/glsa-201207-06.xml(Third Party Advisory)
- http://www.kb.cert.org/vuls/id/903934(Third Party Advisory, US Government Resource)
- http://www.nruns.com/_downloads/advisory28122011.pdf(Third Party Advisory)
- http://www.ocert.org/advisories/ocert-2011-003.html(Third Party Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/72019(Third Party Advisory, VDB Entry)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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