CVE-2022-21190

    Dashboard / Vulnerabilities / CVE-2022-21190

    CVE-2022-21190

    Published: 13 May 2022Last Modified: 12 Aug 2026

    Summary: Prototype Pollution

    Details: This affects the package convict before 6.2.3. This is a bypass of [CVE-2022-22143](https://security.snyk.io/vuln/SNYK-JS-CONVICT-2340604). The [fix](https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880) introduced, relies on the startsWith method and does not prevent the vulnerability: before splitting the path, it checks if it starts with __proto__ or this.constructor.prototype. To bypass this check it's possible to prepend the dangerous paths with any string value followed by a dot, like for example foo.__proto__ or foo.this.constructor.prototype.

    References: https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808, https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571, https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21190.json, https://nvd.nist.gov/vuln/detail/CVE-2022-21190, https://snyk.io/vuln/SNYK-JS-CONVICT-2774757, https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -deef5d77f4f6a714579387c2d67a051396477415

    Affected versions

    v6.2.2
    v6.2.1
    v6.2.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2022-21190 | CVE-DB