Generation of Predictable Numbers or Identifiers Affecting pbkdf2 package, versions <3.1.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PBKDF2-10495498
- published24 Jun 2025
- disclosed23 Jun 2025
- creditNikita Skovoroda
Introduced: 23 Jun 2025
NewCVE-2025-6547 (opens in a new tab)How to fix?
Upgrade pbkdf2 to version 3.1.3 or higher.
Overview
Affected versions of this package are vulnerable to Generation of Predictable Numbers or Identifiers via the toBuffer function. An attacker can predict cryptographic keys that were generated using Uint8Array inputs on affected Node.js versions, leading to compromised security of derived keys or passwords.
Note: This is only exploitable when used in the environment running Node.js or io.js in versions lower than 3.0.0.
Mitigation
Updating to a fixed version isn't sufficient if PBKDF2 was used directly or via a bundling package with algorithm arguments outside the specified list. Verify where those keys are stored, how they are used, and take necessary actions like rotation or replacement.
PoC
require('pbkdf2').pbkdf2Sync(new Uint8Array([1,2,3]), new Uint8Array([1,3,4]), 1024, 32, 'sha256')