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

Quick assessment

Affected
Shopify ruby-lsp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ruby LSP是Shopify开源的一个Ruby语言服务器，提供代码补全和调试功能。 Ruby LSP 0.10.2之前版本和0.26.9之前版本存在代码注入漏洞，该漏洞源于rubyLsp.branch VS Code工作区设置未经清理即插入生成的Gemfile，可能导致执行任意Ruby代码。

AI Predicted 7.8 Difficulty: Easy EPSS 0.50% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34060

Vulnerability Information
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Vulnerability Title
Ruby LSP has arbitrary code execution through branch setting
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby LSP 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby LSP是Shopify开源的一个Ruby语言服务器，提供代码补全和调试功能。 Ruby LSP 0.10.2之前版本和0.26.9之前版本存在代码注入漏洞，该漏洞源于rubyLsp.branch VS Code工作区设置未经清理即插入生成的Gemfile，可能导致执行任意Ruby代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Shopify ruby-lsp < 0.26.9 -
Shopify Shopify.ruby-lsp < 0.10.2 -

II. Public POCs for CVE-2026-34060

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III. Intelligence Information for CVE-2026-34060

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IV. Related Vulnerabilities

Same product: ruby-lsp
Same vendor: Shopify
Same weakness: CWE-94