CVE-2011-4838

Name: CVE-2011-4838
Creator: NVD / NIST
Published: 2011-12-30T01:55:01.5+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.36%

Last modified Jun 16, 2026

CVE-2011-4838 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.36% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.36%

90.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Jruby	Jruby	< 1.6.5.1

References

http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.htmlBroken Link
http://jruby.org/2011/12/27/jruby-1-6-5-1.htmlVendor Advisory
http://rhn.redhat.com/errata/RHSA-2012-1232.htmlBroken Link
http://secunia.com/advisories/47407Third Party Advisory
http://secunia.com/advisories/50084Third Party Advisory
http://security.gentoo.org/glsa/glsa-201207-06.xmlThird Party Advisory
http://www.kb.cert.org/vuls/id/903934Third Party Advisory, US Government Resource
http://www.nruns.com/_downloads/advisory28122011.pdfThird Party Advisory
http://www.ocert.org/advisories/ocert-2011-003.htmlThird Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/72019Third Party Advisory, VDB Entry
http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.htmlBroken Link
http://jruby.org/2011/12/27/jruby-1-6-5-1.htmlVendor Advisory
http://rhn.redhat.com/errata/RHSA-2012-1232.htmlBroken Link
http://secunia.com/advisories/47407Third Party Advisory
http://secunia.com/advisories/50084Third Party Advisory
http://security.gentoo.org/glsa/glsa-201207-06.xmlThird Party Advisory
http://www.kb.cert.org/vuls/id/903934Third Party Advisory, US Government Resource
http://www.nruns.com/_downloads/advisory28122011.pdfThird Party Advisory
http://www.ocert.org/advisories/ocert-2011-003.htmlThird Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/72019Third Party Advisory, VDB Entry

Timeline

Published: Dec 30, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-4838?

How severe is CVE-2011-4838?

Severity scoring for CVE-2011-4838 is pending analysis. The EPSS model estimates a 4.36% probability of exploitation in the next 30 days.

How do I fix CVE-2011-4838?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-4838?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST