What is GHSA-mvhf-547c-h55r?

GHSA-mvhf-547c-h55r is a security advisory published by GitHub Security Advisories with Critical severity. thumbler allows OS Command Injection

Which CVE IDs does GHSA-mvhf-547c-h55r cover?

GHSA-mvhf-547c-h55r covers the following CVE IDs: CVE-2026-26833. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-mvhf-547c-h55r?

GHSA-mvhf-547c-h55r has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

Which products are affected by GHSA-mvhf-547c-h55r?

GHSA-mvhf-547c-h55r affects 1 product, including: npm/thumbler:\u003c= 1.1.2.

GHSA-mvhf-547c-h55rCriticalCVSS 9.8

thumbler allows OS Command Injection

Vendor

GitHub Security Advisories

Published

March 25, 2026

Last Modified

March 31, 2026

🔗 CVE IDs covered (1)

CVE-2026-26833 →

📋 Description

thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.

🎯 Affected products1

npm/thumbler:<= 1.1.2

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2026-26833
https://github.com/mmahrous/thumbler
https://github.com/mmahrous/thumbler/blob/master/lib/thumbler.js
https://github.com/zebbernCVE/CVE-2026-26833
https://www.npmjs.com/package/thumbler
https://github.com/advisories/GHSA-mvhf-547c-h55r