CVE-2026-82745 ETS and Mnesia data layers overwrite an existing record on create instead of enforcing primary-key uniqueness
Attackers can overwrite existing records by supplying a matching primary key during creation, bypassing update policies and destroying data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82745?
CVE-2026-82745 is a medium-severity vulnerability in ash-project ash, published on 1 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper Access Control vulnerability in ash-project ash lets a create action overwrite an existing record when the ETS or Mnesia data layer is used, because neither enforced primary-key uniqueness on insert.
Unlike a SQL data layer, whose unique primary-key constraint rejects a duplicate, the ETS and Mnesia data layers implemented create as a keyed insert that replaces any existing entry with the same primary key (lib/ash/data_layer/ets/ets.ex, lib/ash/data_layer/mnesia/mnesia.ex). An actor who can set the primary key on a create (for example a user-supplied string or integer key) can submit a create whose key matches an existing record and silently overwrite it, destroying and replacing another entity's data without going through the update action or its policies. The fix rejects a create whose primary key already exists with an already-taken error, and only allows duplicates for keyless resources.
This issue affects ash: from 0.4.0 before 3.32.2.
Weakness: CWE-284
Which versions are affected by CVE-2026-82745?
1 open source package ship an affected version, including ash.
| Package | Affected | Fixed in |
|---|---|---|
ash Hex | From 0.4.0 | 3.32.2 |
How do I fix CVE-2026-82745?
Upgrade ash to 3.32.2 or later.
Is CVE-2026-82745 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82745 exists.
Sources
Also known as EEF-CVE-2026-82745, GHSA-92x7-q3h5-wf88.