GHSA-vvv8-xw5f-3f88

Prototype Pollution in mout

Source: GitHub Advisory Database (reviewed) High CVE-2022-21213

Packages

Ecosystem	Package	Affected	Fixed in
npm	mout	< 1.2.4	1.2.4

Details

As written in the advisory (Markdown source, shown as plain text).

This affects all versions of package mout. The deepFillIn function can be used to 'fill missing properties recursively', while the deepMixIn mixes objects into the target object, recursively mixing existing child objects as well. In both cases, the key used to access the target object recursively is not checked, leading to exploiting this vulnerability. **Note:** This vulnerability derives from an incomplete fix of [CVE-2020-7792](https://security.snyk.io/vuln/SNYK-JS-MOUT-1014544).

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2022-21213 advisory
https://github.com/mout/mout/pull/279 web
https://github.com/mout/mout/commit/17ffdc2a96417a63a0147156dc045e90d0d14c64 web
https://github.com/mout/mout package
https://github.com/mout/mout/blob/master/src/object/deepFillIn.js web
https://github.com/mout/mout/blob/master/src/object/deepMixIn.js web
https://snyk.io/vuln/SNYK-JS-MOUT-2342654 web