CVE-2024-35221: Rubygems Rubygems.org

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Rubygems.org is the Ruby community's gem hosting service. A Gem publisher can cause a Remote DoS when publishing a Gem. This is due to how Ruby reads the Manifest of Gem files when using Gem::Specification.from_yaml. from_yaml makes use of SafeYAML.load which allows YAML aliases inside the YAML-based metadata of a gem. YAML aliases allow for Denial of Service attacks with so-called `YAML-bombs` (comparable to Billion laughs attacks). This was patched. There is is no action required by users. This issue is also tracked as GHSL-2024-001 and was discovered by the GitHub security lab.

Affected products

• Rubygems Rubygems.org: before 2024-04-12 (fixed in 2024-04-12)

Published 2024-05-29. Last modified 2026-06-17.