How severe is CVE-2013-0156?

No CVSS score has been assigned to CVE-2013-0156 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-0156?

CVE-2013-0156 affects the following packages: actionpack (RubyGems), actionpack (RubyGems), actionpack (RubyGems), actionpack (RubyGems). Ecosystems affected: RubyGems.

How do I fix CVE-2013-0156?

Update actionpack to version 2.3.15 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2013-0156 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2013-0156, including 2 documented proof-of-concept exploits on Exploit-DB and 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2013-0156 has an EPSS (Exploit Prediction Scoring System) score of 91.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2013-0156 published, and has it been updated?

CVE-2013-0156 was published on January 13, 2013 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

CVE-2013-0156

actionpack Improper Input Validation vulnerability

Also known asGHSA-jmgw-6vjg-jjwg

Published

Jan 13, 2013

Updated

Apr 10, 2026

Affected

4 pkgs

Patched

4 / 4

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

91.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

4 pkgs affected

💎actionpack💎actionpack💎actionpack💎actionpack

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`actionpack`	all versions	2.3.15
💎RubyGems	`actionpack`	≥ 3.0.0&&< 3.0.19	3.0.19
💎RubyGems	`actionpack`	≥ 3.1.0&&< 3.1.10	3.1.10
💎RubyGems	`actionpack`	≥ 3.2.0&&< 3.2.11	3.2.11

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-24019remotemultiple✓ Verified

Ruby on Rails - XML Processor YAML Deserialization Code Execution (Metasploit)

by Metasploit · Jan 10, 2013

Exploit-DB Source

EDB-27527remotemultiple✓ Verified

Ruby on Rails - Known Secret Session Cookie Remote Code Execution (Metasploit)

by Metasploit · Aug 12, 2013

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-0156 in your stack?

O3 detects CVE-2013-0156 across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works