AIKIDO-2026-445255
immer is vulnerable to Prototype Pollution
65
Medium Risk
This Affects:
immerTL;DR
Affected versions of the immer library are vulnerable to Prototype Pollution via draft.constructor.prototype, bypassing prior fixes for CVE-2021-23436. The proxy get trap returned constructor and __proto__ without guards, so attacker-controlled input (e.g. Object.assign(draft, req.body) with {"constructor":{"prototype":{"isAdmin":true}}}) can mutate Object.prototype and affect all objects. This may lead to authentication bypass, authorization escalation, or remote code execution.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
immer is vulnerable to Prototype Pollution in versions 4.0.0 - 11.1.8.
How to fix this
Upgrade the immer library to the patch version.
Are You Affected?
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