What is CVE-2026-39862?

CVE-2026-39862 is a high-severity vulnerability in Shopify Tophat, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-08.

How severe is CVE-2026-39862?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Shopify Tophat

CVE-2026-39862

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.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.006 (43.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Shopify Tophat — versions < 2.5.1

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

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

Frequently asked questions

What is CVE-2026-39862?: CVE-2026-39862 is a high-severity vulnerability in Shopify Tophat, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-08.
How severe is CVE-2026-39862?: High severity. CVSS v3 base score is 8.8 out of 10.