CVE-2026-86338

ash · Vulnerability

CVSS 4.0 6.0 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86338

Published

Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see. This nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer's reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value. As a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == "x") or filter(comment_count == n)) and learn the value from whether rows match — an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect. The fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes. This issue affects ash: from 2.11.0-rc.0 before 3.33.4.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86338

Published

ash

https://repo.hex.pm

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://repo.hex.pm",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.Ash.Policy.Authorizer'"
                    ],
                    "packageName": "ash",
                    "packageURL": "pkg:hex/ash",
                    "product": "ash",
                    "programFiles": [
                        "lib/ash/policy/authorizer/authorizer.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.Ash.Policy.Authorizer':do_replace_ref/2"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "3.33.4",
                            "status": "affected",
                            "version": "2.11.0-rc.0",
                            "versionType": "semver"
                        }
                    ]
                }

ash-project/ash

https://github.com

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.Ash.Policy.Authorizer'"
                    ],
                    "packageName": "ash-project/ash",
                    "packageURL": "pkg:github/ash-project/ash",
                    "product": "ash",
                    "programFiles": [
                        "lib/ash/policy/authorizer/authorizer.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.Ash.Policy.Authorizer':do_replace_ref/2"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "b3d4503241f3deacb5ceb955e10a4fa927da0f67",
                            "status": "affected",
                            "version": "0b6d93c7c4637280b46ae66ea1d2eaf013701238",
                            "versionType": "git"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON