CVE-2021-23438

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    CVE-2021-23438

    Published: 1 Sept 2021Last Modified: 9 Jul 2026

    Summary:

    Details: This affects the package mpath before 0.8.4. A type confusion vulnerability can lead to a bypass of CVE-2018-16490. In particular, the condition ignoreProperties.indexOf(parts[i]) !== -1 returns -1 if parts[i] is ['__proto__']. This is because the method that has been called if the input is an array is Array.prototype.indexOf() and not String.prototype.indexOf(). They behave differently depending on the type of the input.

    References: https://github.com/aheckmann/mpath/commit/89402d2880d4ea3518480a8c9847c541f2d824fc, https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579548, https://snyk.io/vuln/SNYK-JS-MPATH-1577289

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -634a0fa0f97bf1d00791647e3094273ba360a9ed

    Affected versions

    0.8.3
    0.8.2
    0.8.1
    0.8.0

    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-2021-23438 | CVE-DB