CVE-2026-82749 Missing authorization in ash
Attackers can read unauthorized records because unresolved parent filters in Ash relationships incorrectly match null values, bypassing intended scoping restrictions.
- 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-2026-82749?
CVE-2026-82749 is a medium-severity missing authorization 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
Incorrect Authorization vulnerability in ash-project ash widens a relationship's parent(...) scoping filter to match unintended records when the referenced parent field cannot be resolved.
Loading a relationship whose filter references parent(...) resolves that expression against the parent record. resolve_parent_in_filter/3 (lib/ash/actions/read/relationships.ex) resolved an unresolvable parent reference (for example when the referenced field was not selected on the source query) to nil rather than failing. A scoping predicate such as org_id == parent(org_id) then becomes an IS NULL match, and a guard like is_nil(parent(org_id)) or org_id == parent(org_id) activates its unrestricted branch, so the relationship returns records the scope was meant to exclude. The fix fails the read with an error when a parent(...) reference cannot be resolved, instead of defaulting to nil.
This issue affects ash: from 3.13.2 before 3.32.2.
Weakness: CWE-863
Which versions are affected by CVE-2026-82749?
1 open source package ship an affected version, including ash.
| Package | Affected | Fixed in |
|---|---|---|
ash Hex | From 3.13.2 | 3.32.2 |
How do I fix CVE-2026-82749?
Upgrade ash to 3.32.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-82749 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82749 exists.
Sources
Also known as EEF-CVE-2026-82749, GHSA-j8fx-ff37-4j9c.