RubyGems Implements Dependency Cooldowns to Combat Supply Chain Attacks

• •RubyGems has added dependency cooldowns to enhance security against supply chain attacks.
• •The cooldown feature delays package installations to allow time for malicious versions to be identified.
• •Developers must enable the cooldown feature manually, as it is disabled by default.

RubyGems has introduced dependency cooldowns in Bundler to mitigate supply chain attacks that exploit newly published packages. This feature delays the installation of packages until they have been available for a specified number of days, allowing time for malicious versions to be identified and removed. Recent attacks have targeted developer credentials, enabling threat actors to inject malicious code into packages. The cooldown system is designed to protect users by preventing the immediate installation of potentially compromised packages. Developers must manually enable this feature, which is disabled by default. RubyGems joins other package managers like npm and pip, which have already implemented similar measures. The move comes in response to a significant rise in supply chain attacks over the past nine months, with notable incidents affecting multiple ecosystems. The first public proof of concept for a related CVE was released on June 6, 2026, highlighting ongoing vulnerabilities in the ecosystem.