What’s Vulnerable › Vulnerabilities

CVE-2026-34060: Ruby LSP has arbitrary code execution through branch setting

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-31 · updated 2026-06-17
• Weakness: CWE-94

Description

Ruby LSP is an implementation of the language server protocol for Ruby. Prior to Shopify.ruby-lsp version 0.10.2 and ruby-lsp version 0.26.9, the rubyLsp.branch VS Code workspace setting was interpolated without sanitization into a generated Gemfile, allowing arbitrary Ruby code execution when a user opens a project containing a malicious .vscode/settings.json. This issue has been patched in Shopify.ruby-lsp version 0.10.2 and ruby-lsp version 0.26.9.

Affected products

• Shopify Ruby Lsp: before 0.10.2; before 0.26.9 — fixed in 0.10.2, 0.26.9

How to fix

Upgrade to a fixed version: Shopify Ruby Lsp 0.10.2, 0.26.9. Check the vendor advisory for mitigations.

References

• https://github.com/Shopify/ruby-lsp/releases/tag/v0.26.9
• https://github.com/Shopify/ruby-lsp/security/advisories/GHSA-c4r5-fxqw-vh93

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