CVE-2026-78230

Summary

AshAi exposes Ash read actions to language-model tool calls. The read tool accepts an aggregate result type (min, max, sum, avg) that builds an ad-hoc Ash.Query.Aggregate over a named field and returns its raw value.

Ash field policies redact forbidden fields on returned records (replacing them with %Ash.ForbiddenField{}), but that redaction does not apply to aggregate values. A tool caller could therefore read a field the calling actor's field policies forbid by requesting it as an aggregate; min/max in particular return an actual field value. This includes fields that are public? true but restricted per-actor by a field policy, such as sensitive PII. The tool's existing check only required the field to be public, which is a separate axis from per-actor field-policy authorization.

The fix authorizes the aggregated field against the resource's field policies, so aggregating over a field the actor may not see is refused or scoped to the rows where it is visible.

This issue affects ash_ai: from 0.1.0 before 1.0.3.

Affected Software

Weaknesses

• CWE-1220: CWE-1220 Insufficient Granularity of Access Control

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/ash-project/ash_ai/security/advisories/GHSA-v5rw-36x5-r5vx
• https://cna.erlef.org/cves/CVE-2026-78230.html
• https://osv.dev/vulnerability/EEF-CVE-2026-78230
• https://github.com/ash-project/ash_ai/commit/2ba234b50946a3b8116190c8467f9f4dfa5edce7
• https://github.com/ash-project/ash_ai/commit/9c02de581625c342c9870a672830bff28c1d701e

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