CVE-2013-1800: John Nunemaker Crack

High severity, CVSS 7.5. EPSS: 5% chance of exploitation in the next 30 days.

The crack gem 0.3.1 and earlier for Ruby does not properly restrict casts of string values, which might allow remote attackers to conduct object-injection attacks and execute arbitrary code, or cause a denial of service (memory and CPU consumption) by leveraging Action Pack support for (1) YAML type conversion or (2) Symbol type conversion, a similar vulnerability to CVE-2013-0156.

Affected products

• John Nunemaker Crack: up to and including 0.3.1; version 0.1.8 only; version 0.2.0 only; version 0.3.0 only

Published 2013-04-09. Last modified 2026-06-16.