ash-project ash_cloak up to 0.3.x AshCloak.Calculations.Decrypt deserialization

Summaryinfo

A vulnerability categorized as problematic has been discovered in ash-project ash_cloak up to 0.3.x. Affected by this vulnerability is the function AshCloak.Calculations.Decrypt. The manipulation results in deserialization. This vulnerability was named CVE-2026-81319. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in ash-project ash_cloak up to 0.3.x. Affected is the function AshCloak.Calculations.Decrypt. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on availability. CVE summarizes:

Deserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption. AshCloak.Calculations.Decrypt decodes the decrypted binary with Ash.Helpers.non_executable_binary_to_term/1 without the :safe option, so atoms in the payload are interned during the decode and never garbage collected, and the term format's compressed form is inflated transparently. vault.decrypt!() is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated AES.CTR, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. A few hundred kilobytes of distinct atoms exhausts the atom table, or a small compressed payload inflates to gigabytes. This issue affects ash_cloak: from 0.1.0 before 0.4.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-81319 since 08/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 0.4.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_cloak

Version

• 0.1
• 0.2
• 0.3

Website

• Product: https://github.com/ash-project/ash_cloak/

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