CVE-2026-94206
Cloak PBKDF2 field ignores the configured iteration count and runs only :size rounds
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Reserved
- Sep 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | EEF |
Weaknesses
- CWE-916 Use of Password Hash With Insufficient Computational Effort
Affected Products
| Product | Versions |
|---|---|
cloak_ectodanielberkompas |
|
cloak_ectodanielberkompas |
|
cloakdanielberkompas |
|
cloakdanielberkompas |
|
References
- EEF CNA record for CVE-2026-94206relatedthird-party-advisory
- OSV record EEF-CVE-2026-94206related
- Introducing commit a8fa164 in danielberkompas/cloak_ectorelated
- Introducing commit 8699e64 in danielberkompas/cloakrelated
- Fix commit 681c970 in danielberkompas/cloakpatch
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