CVE-2026-34060

Code execution via unsanitized branch interpolation

Published Mar 31, 2026 · Updated Mar 31, 2026

Code injection in Shopify Ruby LSP before 0.26.9 and its VS Code extension before 0.10.2 allows attackers to run Ruby code from a project. The server inserts the workspace-controlled rubyLsp.branch value into .ruby-lsp/Gemfile without neutralizing Ruby syntax. Execution requires a user to open and trust a project whose .vscode/settings.json supplies the value, and code runs with that user's privileges.

CVSS severity7.1
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Shopify Ruby LSP before 0.26.9 and its VS Code extension before 0.10.2 allows attackers to run Ruby code from a project. The server inserts the workspace-controlled rubyLsp.branch value into .ruby-lsp/Gemfile without neutralizing Ruby syntax. Execution requires a user to open and trust a project whose .vscode/settings.json supplies the value, and code runs with that user's privileges.

The record

CVE
CVE-2026-34060
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
Shopify
Product
Ruby LSP
Classifications
CWE-94, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.10.2
  2. Affected versionversion=< 0.26.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Shopify · Ruby LSPversion=< 0.10.2; version=< 0.26.9

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.1GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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