---
id: CVE-2026-78216
title: AshLua exposes Ash read actions to Lua scripts run through an eval action
summary: >-
  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 fi…
severity: medium
cvss: 6
cvssVector: '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'
cwe:
  - CWE-1220
vendor: ash-project
product: ash_lua
affected:
  - ash_lua >= 0.1.0 < 0.2.2
  - >-
    ash-project/ash_lua >= 8675e47cca81f36594083a7e63379bac9e123e72 <
    266a5dcc56d5015b6d316c10606169e753b07450
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:29:09.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78216'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-78216.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/ash-project/ash_lua/commit/266a5dcc56d5015b6d316c10606169e753b07450
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/ash-project/ash_lua/commit/8675e47cca81f36594083a7e63379bac9e123e72
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/ash-project/ash_lua/security/advisories/GHSA-5whv-8rcp-x33j
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-78216'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T17:26:34.675766Z'
cvssSource: cna
ingestedAt: '2026-09-08T19:08:49.600Z'
epss: 0.00427
epssPercentile: 0.3427
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.