CVE-2026-44483 RVF: Prototype pollution in @rvf/set-get reachable via @rvf/core preprocessFormData (HTTP form data)
Attackers can pollute Object.prototype via form data, potentially leading to remote code execution or privilege escalation in React applications using RVF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44483?
CVE-2026-44483 is a high-severity code injection vulnerability in @rvf rvf, published on 27 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-44483?
4 open source packages ship an affected version, including @rvf/set-get.
| Package | Affected | Fixed in |
|---|---|---|
@rvf/set-get npm | From 6.0.0 | 6.0.4 |
@rvf/set-get npm | From 6.0.0 | 6.0.4 |
@rvf/set-get npm | From 7.0.0 | 7.0.2 |
@rvf/set-get npm | From 7.0.0 | 7.0.2 |
How do I fix CVE-2026-44483?
Upgrade @rvf/set-get to a fixed version for your release line: 6.0.4 or 7.0.2.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44483 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44483 exists.
Sources
Also known as GHSA-c567-44rc-m5hq.