chore(deps): update dependency defu to v6.1.5 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
defu	6.1.4 → 6.1.5

GitHub Vulnerability Alerts

CVE-2026-35209

Impact

Applications that pass unsanitized user input (e.g. parsed JSON request bodies, database records, or config files from untrusted sources) as the first argument to defu() are vulnerable to prototype pollution.

A crafted payload containing a __proto__ key can override intended default values in the merged result:

import { defu } from 'defu'

const userInput = JSON.parse('{"__proto__":{"isAdmin":true}}')
const config = defu(userInput, { isAdmin: false })

config.isAdmin // true — attacker overrides the server default

Root Cause

The internal _defu function used Object.assign({}, defaults) to copy the defaults object. Object.assign invokes the __proto__ setter, which replaces the resulting object's [[Prototype]] with attacker-controlled values. Properties inherited from the polluted prototype then bypass the existing __proto__ key guard in the for...in loop and land in the final result.

Fix

Replace Object.assign({}, defaults) with object spread ({ ...defaults }), which uses [[DefineOwnProperty]] and does not invoke the __proto__ setter.

Affected Versions

<= 6.1.4

Credits

Reported by @​BlackHatExploitation

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Release Notes

unjs/defu (defu)

v6.1.5

Compare Source

compare changes

🩹 Fixes

• Prevent prototype pollution via __proto__ in defaults (#​156)
• Ignore inherited enumerable properties (11ba022)

🏡 Chore

• Add tea.yaml (70cffe5)
• Update repo (23cc432)
• Fix typecheck (89df6bb)

✅ Tests

• Add more tests for plain objects (b65f603)

🤖 CI

• Bump node (9237d9c)

❤️ Contributors

• Pooya Parsa (@​pi0)
• Kricsleo (@​kricsleo)

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Configuration

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.52%. Comparing base (7e561f6) to head (2e6ffec).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2201   +/-   ##
=======================================
  Coverage   32.52%   32.52%           
=======================================
  Files           7        7           
  Lines         372      372           
  Branches      131      131           
=======================================
  Hits          121      121           
  Misses        194      194           
  Partials       57       57           

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