CVE-2026-94206

Summary

Use of Password Hash With Insufficient Computational Effort vulnerability in danielberkompas cloak_ecto and danielberkompas cloak allows an attacker who holds the hashed values and the configured secret to brute-force low-entropy plaintexts much faster than configured.

The dump/1 callback that Cloak.Ecto.PBKDF2 (Cloak.Fields.PBKDF2 in cloak before the Ecto code moved to cloak_ecto) injects into a field module calls :pbkdf2.pbkdf2/4 with config[:size] in the iteration-count position. The :iterations setting is validated but never used. With the cloak_ecto defaults (iterations: 600_000, size: 32) each hash runs 32 PBKDF2 rounds instead of 600,000, so offline guessing of values such as email addresses costs about 18,750 times less than configured.

This issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0.

Affected Software

VendorProductVersion RangeStatus
danielberkompascloak_ecto1.0.0-alpha.0 < *affected
danielberkompascloak_ectoa8fa1642b02f1c445a1ee8794c9095eb0921f8f3 < *affected
danielberkompascloak0.7.0 < 1.0.0-alpha.0affected
danielberkompascloak8699e6417a162c39d9f0ef63511bd23d3f38d1d2 < 681c9702b7cd9afe0e5a840751ab009f550c69a9affected

Weaknesses

  • CWE-916: CWE-916 Use of Password Hash With Insufficient Computational Effort

Workarounds

Override dump/1 in the field module that uses Cloak.Ecto.PBKDF2, so that it calls :pbkdf2.pbkdf2/5 with the configured :iterations and :size. Then recompute all stored hashes, because the existing values no longer match.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

References