CVE-2026-82738 - Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service

CVE-2026-82738 - Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/01/2026 - 07:29
CVE ID :CVE-2026-82738
Published : Sept. 1, 2026, 4:18 a.m. | 13 minutes ago
Description :Improper Input Validation vulnerability in ash-project ash allows an attacker to persistently deny reads of a record by storing a non-version-7 UUID in an Ash.Type.UUIDv7 attribute. Ash.Type.UUIDv7.cast_input/2 accepts any well-formed UUID string, including non-version-7 UUIDs, and stores it as a 16-byte binary. On read, cast_stored/2 (lib/ash/type/uuid_v7.ex) routes the stored binary back through cast_input/2, which since an input-validation tightening in v3.6.3 matches only version-7 (and optionally version-4) 16-byte binaries and otherwise expects a 36-character string. A stored non-v7 16-byte binary matches neither clause and returns :error, so every later read of that record fails. An attacker able to set such an attribute poisons the row permanently. The fix decodes any 16-byte stored binary directly in cast_stored/2. This issue affects ash: from 3.6.3 before 3.32.2.
Severity: 5.9 | MEDIUM
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