Medium 5.9Published Sep 1, 2026

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

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects ash-project ash. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ash-project ash

Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: EEF
NVD analysis: Deferred
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ash-project ash ash-project:ash	from 3.6.3 before 3.32.2	CNA record

References

https://github.com/ash-project/ash/security/advisories/GHSA-7xfw-9jwm-9c4cvendor-advisory, related
https://cna.erlef.org/cves/CVE-2026-82738.htmlrelated
https://osv.dev/vulnerability/EEF-CVE-2026-82738related
https://github.com/ash-project/ash/commit/c453cdc0b8570e86ffef0d10e136247f52b3ea76patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.