RCE in Shopify Ruby-Lsp
CVE-2026-34060
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.005 · change: -0.001
Affected products
- Shopify Ruby-Lsp — versions < 0.26.9
- Shopify Ruby Lsp
- Shopify Shopify.ruby-Lsp — versions < 0.10.2
Weakness classification (CWE)
References
- github.com/Shopify/ruby-lsp/security/advisories/GHSA-c4r5-fxqw-vh93 (Mitigation, Vendor Advisory)
- github.com/Shopify/ruby-lsp/releases/tag/v0.26.9 (Release Notes)
Frequently asked questions
- What is CVE-2026-34060?
- CVE-2026-34060 is a critical-severity vulnerability in Shopify Ruby-Lsp, classified under Code Injection. CVSS score: 9.8/10. Published 2026-03-31.
- How severe is CVE-2026-34060?
- Critical severity. CVSS v3 base score is 9.8 out of 10.