Arbitrary Code Execution Affecting js-yaml package, versions <3.13.1



    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

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  • Snyk ID SNYK-JS-JSYAML-174129
  • published 7 Apr 2019
  • disclosed 5 Apr 2019
  • credit Alex Kocharin

Introduced: 5 Apr 2019

CVE NOT AVAILABLE CWE-94 Open this link in a new tab

How to fix?

Upgrade js-yaml to version 3.13.1 or higher.


js-yaml is a human-friendly data serialization language.

Affected versions of this package are vulnerable to Arbitrary Code Execution. When an object with an executable toString() property used as a map key, it will execute that function. This happens only for load(), which should not be used with untrusted data anyway. safeLoad() is not affected because it can't parse functions.