Medium severity5.6NVD Advisory· Published Sep 1, 2021· Updated Jun 17, 2026
CVE-2021-23436
CVE-2021-23436
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
immernpm | >= 7.0.0, < 9.0.6 | 9.0.6 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237nvdPatchThird Party AdvisoryWEB
- snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266nvdExploitPatchThird Party AdvisoryWEB
- snyk.io/vuln/SNYK-JS-IMMER-1540542nvdExploitPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-33f9-j839-rf8hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-23436ghsaADVISORY
News mentions
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