AIKIDO-2026-189719
@mikro-orm/core is vulnerable to Prototype Pollution
37
CVE Score
Low
Prototype Pollution
TL;DR
Utils.copy() in @mikro-orm/core builds the copy with Object.create() and then assigns each enumerable key onto it. An own __proto__ key, as produced by JSON.parse(), reaches the inherited setter and replaces the copy's prototype instead of being copied. Untrusted JSON reaching copy paths therefore replace the copied object's prototype, bypassing the guards from earlier prototype pollution fixes. The fix skips an own __proto__ key when cloning.
How do I fix this?
Upgrade the @mikro-orm/core library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application passes data parsed from untrusted JSON into MikroORM APIs that copy it.
Package
Versions
5.0.1 - 7.1.10
Fixed in 7.1.11Background info
@mikro-orm/core is vulnerable to Prototype Pollution in versions 5.0.1 - 7.1.10.
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