Highlights
Prototype Pollution: 3 prior fixes. Scrutinize any change in this area.
packages/mui-system/src/cssVars/cssVarsParser.ts: most-fixed (1 issue). Treat as high-risk during review.
3 high-severity fixes in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
Prototype Pollution: Core recursive merge utility; a single unguarded path can pollute Object.prototype globally, affecting all consumers.
Prototype Pollution: Fast assignment utility merges/clones untrusted objects; lacks dangerous-key filtering in both mergeObject and cloneObject.
Prototype Pollution: CSS variable parser writes through attacker-controlled keys via assignNestedKeys, enabling pollution through crafted style inputs.