CVE-2026-127109
Published Nov 12, 2026
Modified Nov 12, 2026
Description
A code injection vulnerability in promzard’s template-loading functionality allows an attacker who can control property names in the context object (ctx) to execute arbitrary code with the privileges of the Node.js process. The library inserts context property names into a generated function’s parameter list without validation or escaping and evaluates the resulting source using `vm.runInThisContext()`. A crafted property name can escape the parameter list and inject JavaScript code, even when the template file is fully trusted.
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References
Other References
Frequently Asked Questions
What is CVE-2026-127109? +
A code injection vulnerability in promzard’s template-loading functionality allows an attacker who can control property names in the context object (ctx) to execute arbitrary code with the privileges of the Node.js process. The library inserts context property names into a generated function’s parameter list without validation or escaping and evaluates the resulting source using `vm.runInThisContext()`. A crafted property name can escape the parameter list and inject JavaScript code, even when the template file is fully trusted.
How do I check if I'm vulnerable to CVE-2026-127109? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.
