Vulnerability-Lookup

CVE-2026-44483 (GCVE-0-2026-44483)

Vulnerability from cvelistv5 – Published: 2026-05-27 15:20 – Updated: 2026-05-27 18:48

Title

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

Summary

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.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-27 18:48 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/airjp73/rvf/security/advisorie…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version	CPE status
airjp73	rvf	Affected: >= 7.0.0, < 7.0.2 Affected: >= 6.0.0, < 6.0.4	guessed
@rvf	set-get	Affected: >= 7.0.0, < 7.0.2 Affected: >= 6.0.0, < 6.0.4	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44483

Vulnerability from fkie_nvd - Published: 2026-05-27 17:16 - Updated: 2026-06-17 10:50

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/airjp73/rvf/security/advisories/GHSA-c567-44rc-m5hq
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/airjp73/rvf/security/advisories/GHSA-c567-44rc-m5hq

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-C567-44RC-M5HQ

Vulnerability from github – Published: 2026-05-11 16:09 – Updated: 2026-06-08 23:49

Summary

@rvf/set-get has a prototype pollution issue that's reachable via @rvf/core preprocessFormData (HTTP form data)

Details

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+:

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

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

const form = new FormData();
form.append("username", "alice");
form.append("__proto__[polluted]", "yes");

preprocessFormData(form);
console.log(({}).polluted); // -> 'yes'

The field name __proto__[polluted] is the kind of value an attacker can submit from any HTML form or HTTP client. After the call, every plain object in the process inherits polluted = 'yes'.

A second working payload is constructor.prototype.<key>=<value>, which goes through setPath walking constructor then prototype.

Impact

Any property assignable on Object.prototype of the server process, set by a single unauthenticated HTTP request.
Persists for the life of the worker process and affects every subsequent request handled by the same process.
Direct downstream consequences depend on the host application and the rest of its dependency tree, but typical risks include: bypassing if (obj.isAdmin) style checks, injecting unintended config values into objects merged with user input, breaking template rendering, and crashing the worker by polluting properties used by other libraries (DoS).
Worth noting: the visible output of preprocessFormData does not contain the malicious key, so the attack leaves no obvious trace in request logs that show parsed bodies.

CVSS

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L (8.2, High)

Integrity is High because the primitive lets the attacker change the meaning of property reads on every object in the process. Confidentiality is None and Availability is Low without a named downstream gadget; both could be higher in a specific consuming app.

Remediation for users

Upgrade to @rvf/set-get 7.0.2 or 6.0.4. If you cannot upgrade @rvf/core directly, an npm / pnpm override on @rvf/set-get works.

Credit

Reported by Mohamed Bassia (@0xBassia).

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@rvf/set-get"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@rvf/set-get"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44483"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-11T16:09:40Z",
    "nvd_published_at": "2026-05-27T17:16:39Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\n`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.\n\nThis 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.\n\n## Affected versions\n\n- `@rvf/set-get` `\u003c 7.0.2` (7.x line)\n- `@rvf/set-get` `\u003c 6.0.4` (6.x line)\n\nReached through `@rvf/core` versions that depend on a vulnerable `@rvf/set-get` (current `8.1.0` resolves to `7.0.1` without the override).\n\n## Patched\n\n- `@rvf/set-get` `7.0.2`\n- `@rvf/set-get` `6.0.4`\n\nThe fix adds a `REJECT_KEYS` blocklist (`__proto__`, `constructor`, `prototype`) and throws when one is encountered while walking a path inside `setPath`.\n\n## Proof of concept\n\nInstall a vulnerable resolution and run on Node 18+:\n\n```json\n{\n  \"dependencies\": { \"@rvf/core\": \"8.1.0\" },\n  \"overrides\": { \"@rvf/set-get\": \"7.0.1\" }\n}\n```\n\n```js\nconst { preprocessFormData } = require(\u0027@rvf/core\u0027);\n\nconst form = new FormData();\nform.append(\"username\", \"alice\");\nform.append(\"__proto__[polluted]\", \"yes\");\n\npreprocessFormData(form);\nconsole.log(({}).polluted); // -\u003e \u0027yes\u0027\n```\n\nThe field name `__proto__[polluted]` is the kind of value an attacker can submit from any HTML form or HTTP client. After the call, every plain object in the process inherits `polluted = \u0027yes\u0027`.\n\nA second working payload is `constructor.prototype.\u003ckey\u003e=\u003cvalue\u003e`, which goes through `setPath` walking `constructor` then `prototype`.\n\n## Impact\n\n- Any property assignable on `Object.prototype` of the server process, set by a single unauthenticated HTTP request.\n- Persists for the life of the worker process and affects every subsequent request handled by the same process.\n- Direct downstream consequences depend on the host application and the rest of its dependency tree, but typical risks include: bypassing `if (obj.isAdmin)` style checks, injecting unintended config values into objects merged with user input, breaking template rendering, and crashing the worker by polluting properties used by other libraries (DoS).\n- Worth noting: the visible output of `preprocessFormData` does not contain the malicious key, so the attack leaves no obvious trace in request logs that show parsed bodies.\n\n## CVSS\n\n`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L` (8.2, High)\n\nIntegrity is High because the primitive lets the attacker change the meaning of property reads on every object in the process. Confidentiality is None and Availability is Low without a named downstream gadget; both could be higher in a specific consuming app.\n\n## Remediation for users\n\nUpgrade to `@rvf/set-get` `7.0.2` or `6.0.4`. If you cannot upgrade `@rvf/core` directly, an `npm` / `pnpm` override on `@rvf/set-get` works.\n\n## Credit\n\nReported by Mohamed Bassia (@0xBassia).",
  "id": "GHSA-c567-44rc-m5hq",
  "modified": "2026-06-08T23:49:03Z",
  "published": "2026-05-11T16:09:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/airjp73/rvf/security/advisories/GHSA-c567-44rc-m5hq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44483"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/airjp73/rvf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@rvf/set-get has a prototype pollution issue that\u0027s reachable via @rvf/core preprocessFormData (HTTP form data)"
}

Sightings

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Nomenclature

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Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-44483 (GCVE-0-2026-44483)

FKIE_CVE-2026-44483

GHSA-C567-44RC-M5HQ

Summary

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Proof of concept

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