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.

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)

EPSS: 0.005 (40.4th percentile) — read the EPSS interpretation.

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.

Affected products

Shopify Ruby-lsp — versions < 0.26.9
Shopify Ruby_lsp
Shopify Shopify.ruby-lsp — versions < 0.10.2

Weakness classification (CWE)

CWE-94 — Code Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, 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.