critical9.8
CVE-2021-23436
Prototype Pollution in immer
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | immer | >= 7.0.0, < 9.0.6 | 9.0.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Immer Project | Immer | before 9.0.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266
- https://snyk.io/vuln/SNYK-JS-IMMER-1540542
- https://github.com/advisories/GHSA-33f9-j839-rf8h
- https://nvd.nist.gov/vuln/detail/CVE-2021-23436