CVE-2026-118389
Deferred
Deferred - Pending Action
RubyGems Registry Malicious Gem Metadata Injection
Vulnerability report for CVE-2026-118389, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-11-15
Last updated on: 2026-11-15
Assigner: Gitea Limited
Description
Description
The RubyGems package registry accepted gems whose platform, dependency names or dependency version requirements contain newline characters. Because the compact index served to clients is line-based, a user who can publish a gem to an owner's registry could forge index entries, such as packages that do not exist or additional versions of an existing gem with dependencies of their choice. Clients that resolve gems from that registry could then be led to install attacker-chosen dependencies. Gems with such metadata are now rejected.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-74 | The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. |
