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CVE-2026-34060

Ruby LSP has arbitrary code execution through branch setting

Published: Mar 31, 2026Updated: Jun 3, 2026 Sources: CVE List NVDCWE-94
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.5%
Top 62.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

ruby-lspShopify
SaaS
Web & CMS Plugins / ecommerce-platform
Shopify.ruby-lspShopify
SaaS
Web & CMS Plugins / ecommerce-platform
ruby lspshopify
SaaS
Web & CMS Plugins / ecommerce-platform
shopifycommercialUSWeb & CMS Plugins

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Mar 31, 2026
Last Updated
Jun 3, 2026

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