CVE-2026-82738

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.

• CWE-20

• https://cna.erlef.org/cves/CVE-2026-82738.html
• https://github.com/ash-project/ash/commit/c453cdc0b8570e86ffef0d10e136247f52b3ea76
• https://github.com/ash-project/ash/security/advisories/GHSA-7xfw-9jwm-9c4c
• https://osv.dev/vulnerability/EEF-CVE-2026-82738
• https://github.com/ash-project/ash/security/advisories/GHSA-7xfw-9jwm-9c4c

Published

Sep 1, 2026

Last Modified

Sep 1, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-82732Improper Input Validation vulnerability in ash-project ash_t…6.3
• CVE-2026-82733Generation of Error Message Containing Sensitive Information…6.3
• CVE-2026-82734Improper Validation of Specified Quantity in Input vulnerabi…2.1
• CVE-2026-82735Uncontrolled Resource Consumption vulnerability in ash-proje…5.9
• CVE-2026-82736Incorrect Behavior Order: Validate Before Canonicalize vulne…2.1
• CVE-2026-82737Integer Overflow or Wraparound vulnerability in ash-project …5.9
• CVE-2026-82739Generation of Error Message Containing Sensitive Information…2.1
• CVE-2026-8274A security vulnerability has been detected in npitre cramfs-…5.3
• CVE-2026-82740Improper Input Validation vulnerability in ash-project ash f…2.1
• CVE-2026-82741Improper Validation of Specified Type of Input vulnerability…2.1
• CVE-2026-82742Uncontrolled Resource Consumption vulnerability in ash-proje…5.9
• CVE-2026-82743Uncontrolled Resource Consumption vulnerability in ash-proje…2.1