AIKIDO-2026-922647
yargs is vulnerable to Prototype Pollution
24
Low Risk
This Affects:
yargsTL;DR
mergeDeep in apply-extends recursively merges configuration objects without skipping __proto__ keys. Attacker-influenced config that includes __proto__ can therefore pollute the merged object's prototype and alter later property lookups. The fix skips __proto__ during the deep merge.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and applyExtends / config extends merges attacker-influenced objects.
Background info
yargs is vulnerable to Prototype Pollution in versions 0.0.1 - 18.0.0.
How to fix this
Upgrade the yargs library to the patch version.
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