CVE-2026-78216

Description

AshLua exposes Ash read actions to Lua scripts run through an eval action. A read call accepts an operation (list, min, max, first, 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 script could therefore read a field the calling actor's field policies forbid by requesting it as an aggregate instead of as a field. This includes fields that are public? true but restricted per-actor by a field policy, such as sensitive PII. The prior hardening only enforced the exposed-field allow-list (field visibility), 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_lua: from 0.1.0 before 0.2.2.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• https://cna.erlef.org/cves/CVE-2026-78216.html
• https://github.com/ash-project/ash_lua/commit/266a5dcc56d5015b6d316c10606169e753b07450
• https://github.com/ash-project/ash_lua/commit/8675e47cca81f36594083a7e63379bac9e123e72
• https://github.com/ash-project/ash_lua/security/advisories/GHSA-5whv-8rcp-x33j
• https://osv.dev/vulnerability/EEF-CVE-2026-78216
• https://hex.pm/packages/ash_lua

CWEs

CWE-1220