Is CVE-2013-0156 being actively exploited?

CVE-2013-0156 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-0156?

CVE-2013-0156 has a CVSS 2.0 base score of 7.5 (HIGH).

CVE-2013-0156

HIGH · CVSS 7.5EPSS 99.4%EU EUVD

active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before 3.0.19, 3.1.x before 3.1.10, and 3.2.x before 3.2.11 does not properly restrict casts of string values, which allows remote attackers to conduct object-injection attacks and execute arbitrary code, or cause a denial of service (memory and CPU consumption) involving nested XML entity references, by leveraging Action Pack support for (1) YAML type conversion or (2) Symbol type conversion.

Key facts

CVSS score: 7.5 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness (CWE): CWE-20
EPSS score: 99.4% (100th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2017-0264)
Published: January 13, 2013
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-0264 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

debian / debian linux
debian / debian linux
rubyonrails / rails
rubyonrails / ruby on rails

References

http://ics-cert.us-cert.gov/advisories/ICSA-13-036-01A(Third Party Advisory, US Government Resource)
http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.html(Mailing List, Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2013-0153.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2013-0154.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2013-0155.html(Third Party Advisory)
http://weblog.rubyonrails.org/2013/1/28/Rails-3-0-20-and-2-3-16-have-been-released/(Vendor Advisory)
http://www.debian.org/security/2013/dsa-2604(Third Party Advisory)
http://www.fujitsu.com/global/support/software/security/products-f/sw-sv-rcve-ror201301e.html(Third Party Advisory)
http://www.insinuator.net/2013/01/rails-yaml/(Third Party Advisory)
http://www.kb.cert.org/vuls/id/380039(Third Party Advisory, US Government Resource)
http://www.kb.cert.org/vuls/id/628463(Third Party Advisory, US Government Resource)
https://community.rapid7.com/community/metasploit/blog/2013/01/09/serialization-mischief-in-ruby-land-cve-2013-0156(Third Party Advisory)
https://groups.google.com/group/rubyonrails-security/msg/c1432d0f8c70e89d?dmode=source&output=gplain(Third Party Advisory)
https://puppet.com/security/cve/cve-2013-0156(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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