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GHSA-33f9-j839-rf8h

Prototype Pollution in immer

Source: GitHub Advisory Database (reviewed) Critical CVE-2021-23436

Packages

EcosystemPackageAffectedFixed in
npm immer >= 7.0.0, < 9.0.6 9.0.6

Details

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

This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition `(p === "__proto__" || p === "constructor")` in `applyPatches_` returns false if `p` is `['__proto__']` (or `['constructor']`). The `===` operator (strict equality operator) returns false if the operands have different type.

References

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