CVE-2013-0156

Name: CVE-2013-0156
Creator: NVD / NIST
Published: 2013-01-13T22:55:00.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 99.45%

Last modified Jun 16, 2026

CVE-2013-0156 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 99.45% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

99.45%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Rubyonrails	Rails	>= 3.2.0, < 3.2.11
Rubyonrails	Ruby On Rails	< 2.3.15
Rubyonrails	Ruby On Rails	>= 3.0.0, < 3.0.19
Rubyonrails	Ruby On Rails	>= 3.1.0, < 3.1.10
Debian	Debian Linux	6.0
Debian	Debian Linux	7.0

References

http://ics-cert.us-cert.gov/advisories/ICSA-13-036-01AThird Party Advisory, US Government Resource
http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0153.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0154.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0155.htmlThird 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-2604Third Party Advisory
http://www.fujitsu.com/global/support/software/security/products-f/sw-sv-rcve-ror201301e.htmlThird Party Advisory
http://www.insinuator.net/2013/01/rails-yaml/Third Party Advisory
http://www.kb.cert.org/vuls/id/380039Third Party Advisory, US Government Resource
http://www.kb.cert.org/vuls/id/628463Third Party Advisory, US Government Resource
https://community.rapid7.com/community/metasploit/blog/2013/01/09/serialization-mischief-in-ruby-land-cve-2013-0156Third Party Advisory
https://groups.google.com/group/rubyonrails-security/msg/c1432d0f8c70e89d?dmode=source&output=gplainThird Party Advisory
https://puppet.com/security/cve/cve-2013-0156Third Party Advisory
http://ics-cert.us-cert.gov/advisories/ICSA-13-036-01AThird Party Advisory, US Government Resource
http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0153.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0154.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0155.htmlThird 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-2604Third Party Advisory
http://www.fujitsu.com/global/support/software/security/products-f/sw-sv-rcve-ror201301e.htmlThird Party Advisory
http://www.insinuator.net/2013/01/rails-yaml/Third Party Advisory
http://www.kb.cert.org/vuls/id/380039Third Party Advisory, US Government Resource
http://www.kb.cert.org/vuls/id/628463Third Party Advisory, US Government Resource
https://community.rapid7.com/community/metasploit/blog/2013/01/09/serialization-mischief-in-ruby-land-cve-2013-0156Third Party Advisory
https://groups.google.com/group/rubyonrails-security/msg/c1432d0f8c70e89d?dmode=source&output=gplainThird Party Advisory
https://puppet.com/security/cve/cve-2013-0156Third Party Advisory

Timeline

Published: Jan 13, 2013
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-0156?

How severe is CVE-2013-0156?

Severity scoring for CVE-2013-0156 is pending analysis. The EPSS model estimates a 99.45% probability of exploitation in the next 30 days.

How do I fix CVE-2013-0156?

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-2013-0156?

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

Scan your code now

Source: NVD / NIST