What’s Vulnerable › Vulnerabilities

CVE-2026-94206: Cloak PBKDF2 field ignores the configured iteration count and runs only :size rounds

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-06
• Weakness: CWE-916

Description

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 products

• danielberkompas cloak: from 0.7.0 before 1.0.0-alpha.0 — fixed in 1.0.0-alpha.0
• danielberkompas cloak_ecto: from 1.0.0-alpha.0

How to fix

Upgrade to a fixed version: danielberkompas cloak 1.0.0-alpha.0. Check the vendor advisory for mitigations.

References

• https://cna.erlef.org/cves/CVE-2026-94206.html
• https://github.com/danielberkompas/cloak/commit/681c9702b7cd9afe0e5a840751ab009f550c69a9
• https://github.com/danielberkompas/cloak/commit/8699e6417a162c39d9f0ef63511bd23d3f38d1d2
• https://github.com/danielberkompas/cloak_ecto/commit/a8fa1642b02f1c445a1ee8794c9095eb0921f8f3
• https://osv.dev/vulnerability/EEF-CVE-2026-94206

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