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Prototype Pollution in mixin-deep

critical severity GitHub Reviewed Published Aug 27, 2019 • Updated Jul 27, 2021

Package

npm mixin-deep (npm)

Affected versions

< 1.3.2
= 2.0.0

Patched versions

1.3.2
2.0.1

Description

Versions of mixin-deep prior to 2.0.1 or 1.3.2 are vulnerable to Prototype Pollution. The mixinDeep function fails to validate which Object properties it updates. This allows attackers to modify the prototype of Object, causing the addition or modification of an existing property on all objects.

Recommendation

If you are using mixin-deep 2.x, upgrade to version 2.0.1 or later.
If you are using mixin-deep 1.x, upgrade to version 1.3.2 or later.

References

CVE ID

CVE-2019-10746

CVSS Score

9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H