CVE-2025-32014: estree-util-value-to-estree allows prototype pollution in generated ESTree

When generating an ESTree from a value with a property named __proto__, valueToEstree would generate an object that specifies a prototype instead.

Example:

import { generate } from 'astring'
import { valueToEstree } from 'estree-util-value-to-estree'

const estree = valueToEstree({
['__proto__']: {}
})
const code = generate(estree)
console.log(code)

Output:

{
"__proto__": {}
}

References

Code Behaviors & Features

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