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EUVD-2026-322257

fkie_cve-2026-44483

RVF (formerly Remix Validated Form) provides easy form validation and state management for React. From 6.0.0 to before 6.0.4 and 7.0.2, setPath in @rvf/set-get (used by @rvf/core to flatten incoming form data into a nested object) does not block the keys __proto__, constructor, or prototype when walking a path. Because field names in submitted form data are passed directly to setPath via preprocessFormData (and through parseFormData / validate), an attacker who can submit a form to a Remix / React Router app using the library can set arbitrary properties on Object.prototype of the running server process. This is a default-reachable prototype pollution primitive: no special configuration is required. Any endpoint that accepts a form via parseFormData or runs a validator created with createValidator is affected. This vulnerability is fixed in 6.0.4 and 7.0.2.

GHSA-c567-44rc-m5hq — @rvf/set-get has a prototype pollution issue that's reachable via @rvf/core preprocessFormData (HTTP form data)

Affected: npm: @rvf/set-get

## Summary

`setPath` in `@rvf/set-get` (used by `@rvf/core` to flatten incoming form data into a nested object) does not block the keys `__proto__`, `constructor`, or `prototype` when walking a path. Because field names in submitted form data are passed directly to `setPath` via `preprocessFormData` (and through `parseFormData` / `validate`), an attacker who can submit a form to a Remix / React Router app using the library can set arbitrary properties on `Object.prototype` of the running server process.

This is a default-reachable prototype pollution primitive: no special configuration is required. Any endpoint that accepts a form via `parseFormData` or runs a validator created with `createValidator` is affected.

## Affected versions

- `@rvf/set-get` `< 7.0.2` (7.x line) - `@rvf/set-get` `< 6.0.4` (6.x line)

Reached through `@rvf/core` versions that depend on a vulnerable `@rvf/set-get` (current `8.1.0` resolves to `7.0.1` without the override).

## Patched

- `@rvf/set-get` `7.0.2` - `@rvf/set-get` `6.0.4`

The fix adds a `REJECT_KEYS` blocklist (`__proto__`, `constructor`, `prototype`) and throws when one is encountered while walking a path inside `setPath`.

## Proof of concept

Install a vulnerable resolution and run on Node 18+:

```json { "dependencies": { "@rvf/core": "8.1.0" }, "overrides": { "@rvf/set-get": "7.0.1" } } ```

```js const { preprocessFormData } = require('@rvf/core');

const form = new FormData(); form.append("username", "alice"); form.append(…