Vulnerability · Published Oct 9, 2026 · Assigned by EEF
CVE-2026-101028Ash.count, Ash.exists and Ash.aggregate skip related resources' read policies in filters and sorts
Medium 6.0
In plain English
A medium-severity incorrect authorization in ash from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Official description
Incorrect Authorization vulnerability in ash-project ash allows an actor to infer data in related records they cannot read via Ash.count/2, Ash.exists/2 and Ash.aggregate/3. Ash.Actions.Aggregate.run/4 (lib/ash/actions/aggregate.ex) applied only the root resource's read policy before running the aggregate query. The read path also applies each related resource's read policy to filter and sort references that cross a relationship, directly (for example comments.body) or through an aggregate over one, but the aggregate path skipped that step. A caller whose filter or sort reaches these functions, for example through Ash.Query.filter_input/2, an ash_lua script, or an AshAi tool offering count or exists results, can test conditions against related rows hidden from them and recover their existence and attribute values one query at a time. Ash.read/2 and its page counts are not affected. This issue affects ash: from 2.6.0 before 3.34.6.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash | 2.6.0 – before 3.34.6 |
| ash-project | ash | 30eaf1c6e8524527b703e3c4bfeff7967ee0b37c – before 80936187b27ee94f15cd875affd3141b5cb23185 |
Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References
- GHSA-xj24-8f5c-pp5p vendor-advisory, related
- EEF CNA record for CVE-2026-101028 related
- OSV record EEF-CVE-2026-101028 related
- Introducing commit 30eaf1c in ash-project/ash related
- Fix commit 8093618 in ash-project/ash patch