CVE-2011-4838
JRuby before 1.6.5.1 computes hash values without restricting the ability to trigger hash...
CVE-2011-4838 is a medium vulnerability (CVSS 5.0) in Jruby, published December 30, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.20%, the 91st percentile. Fixed in jruby 1.5.6-4.
- Severity
- 5.0 MediumCVSS 2.0, NVD
- Exploit chance
- 4.20%EPSS, 91st percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
1.5.6-4jruby +3 more
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.
Exploit likelihood
Affected products
Affected packages
What each source reports
NVD Score used
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.
- Record
CVE-2011-4838- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE ListNo score
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.
- Record
CVE-2011-4838- Updated
- 2026-11-02
EUVDEUVD-2011-4756No score
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.
- Record
EUVD-2011-4756- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cgqc-fqxr-q6r6No score
JRuby before 1.6.5.1 computes hash values without restricting the ability to trigger hash...
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.
- Record
GHSA-cgqc-fqxr-q6r6- Weakness
- CWE-400
- Updated
- 2026-11-02
OSVNo score
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.
- Record
CVE-2011-4838- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-4838No score
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.
- Record
DEBIAN-CVE-2011-4838- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
nruns.com/_downloads/advisory28122011.pdf
exchange.xforce.ibmcloud.com/vulnerabilities/72019
jruby.org/2011/12/27/jruby-1-6-5-1.html
secunia.com/advisories/50084
kb.cert.org/vuls/id/903934
Show 7 moreShow less
rhn.redhat.com/errata/RHSA-2012-1232.html
archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
security.gentoo.org/glsa/glsa-201207-06.xml
ocert.org/advisories/ocert-2011-003.html
nvd.nist.gov/vuln/detail/CVE-2011-4838
github.com/advisories/GHSA-cgqc-fqxr-q6r6
security-tracker.debian.org/tracker/CVE-2011-4838