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.
Published: 2026-09-01
Score: 5.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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History

Tue, 01 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
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.
Title Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service
First Time appeared Ash-project
Ash-project ash
Weaknesses CWE-20
CPEs cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
Vendors & Products Ash-project
Ash-project ash
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Ash-project Ash
cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-09-01T03:26:23.035Z

Reserved: 2026-08-31T00:59:10.002Z

Link: CVE-2026-82738

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T04:18:03.387

Modified: 2026-09-01T04:18:03.387

Link: CVE-2026-82738

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T04:30:03Z

Weaknesses
  • CWE-20

    Improper Input Validation