Shopify tophat up to 2.5.0 URL Parser /bin/bash os command injection

Summaryinfo

A vulnerability labeled as critical has been found in Shopify tophat up to 2.5.0. This issue affects some unknown processing of the file /bin/bash of the component URL Parser. Such manipulation leads to os command injection. This vulnerability is uniquely identified as CVE-2026-39862. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Shopify tophat up to 2.5.0. Affected by this issue is an unknown part of the file /bin/bash of the component URL Parser. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Tophat is a mobile applications testing harness. Prior to 2.5.1, Tophat is affected by remote code execution via crafted tophat:// or http://localhost:29070 URLs. The arguments query parameter flows unsanitized from URL parsing through to /bin/bash -c execution, allowing an attacker to execute arbitrary commands on a developer's macOS workstation. Any developer with Tophat installed is vulnerable. For previously trusted build hosts, no confirmation dialog appears. Attacker commands run with the user's permissions. This vulnerability is fixed in 2.5.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-39862 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 2.5.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Shopify

Name

• tophat

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5.0

Website

• Product: https://github.com/Shopify/tophat/

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