Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs (CVE-2026-82740) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82740

Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs

Answer in brief

CVE-2026-82740 records a Unknown severity vulnerability in Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs. The current sources do not mark it as known exploited. The current feed maps ash-project/ash (generic), ash-project/ash (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Sep 1, 2026Source checked Sep 1, 2026First seen by HOL Sep 1, 2026Material review Sep 1, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ash-project/ash (generic), ash-project/ash (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ash-project/ashgeneric	>=2.16.1 <3.32.2	3.32.2
ash-project/ashgeneric	>=7b50a401d85018371659e51c34c89d7e1d0c2ac9 <c85ccff7dc6e3b0b3e40ad788b0056b3b6bee5ce	c85ccff7dc6e3b0b3e40ad788b0056b3b6bee5ce

Recommended response

Check inventory. Check lockfiles and deployed manifests for ash-project/ash, ash-project/ash.
Review the reported fix. Update ash-project/ash to 3.32.2; ash-project/ash to c85ccff7dc6e3b0b3e40ad788b0056b3b6bee5ce if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 1, 2026

Sources and claim methodology

Upstream source description

Improper Input Validation vulnerability in ash-project ash fails to enforce the outer array constraints on a doubly-nested {:array, {:array, type}} attribute, letting invalid input pass validation. Ash.Type.apply_constraints/3 (lib/ash/type/type.ex) handled the {:array, {:array, type}} case by mapping only the inner {:array, type} constraints over each element, so constraints declared on the outer array (such as min_length, max_length, and nil_items?) were never applied. An attacker could submit an outer list that violates those constraints (too many elements, or nil entries where disallowed) and have it accepted and persisted. The fix enforces the outer array constraints and adds explicit handling for nil and non-list inputs. This issue affects ash: from 2.16.1 before 3.32.2.

Quoted source text, attributed separately from HOL analysis.