danielberkompas cloak/cloak_ecto PBKDF2 dump size weak password hash

Summaryinfo

A vulnerability, which was classified as problematic, has been found in danielberkompas cloak and cloak_ecto. This vulnerability affects the function dump of the component PBKDF2. The manipulation of the argument size leads to weak password hash. This vulnerability is referenced as CVE-2026-94206. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in danielberkompas cloak and cloak_ecto (affected version unknown). This issue affects the function dump of the component PBKDF2. The manipulation of the argument size with an unknown input leads to a weak password hash vulnerability. Using CWE to declare the problem leads to CWE-916. The product generates a hash for a password, but it uses a scheme that does not provide a sufficient level of computational effort that would make password cracking attacks infeasible or expensive. Impacted is confidentiality. The summary by CVE is:

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.

The advisory is shared at cna.erlef.org. The identification of this vulnerability is CVE-2026-94206 since 09/24/2026. The exploitation is known to be difficult. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1552 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• danielberkompas

Name

• cloak
• cloak_ecto

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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