SleeperGem Uses Three Malicious RubyGems Packages to Target Developer Machines

Cybersecurity researchers have flagged a new software supply chain attack codenamed SleeperGem targeting the Ruby ecosystem after three malicious gems were published to RubyGems with the end goal of serving additional payloads.

The rogue gems are listed below –

git_credential_manager (versions 2.8.0, 2.8.1, 2.8.2, 2.8.3) – Published on July 18, 2026
Dendreo (versions 1.1.3, 1.1.4) –