{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-82741", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-31T00:59:10.002Z", "datePublished": "2026-09-01T03:33:03.442Z", "dateUpdated": "2026-09-01T15:13:10.142Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Ash.Type.Union'"], "packageName": "ash", "packageURL": "pkg:hex/ash", "product": "ash", "programFiles": ["lib/ash/type/union.ex"], "programRoutines": [{"name": "'Elixir.Ash.Type.Union':dump_to_native/2"}], "repo": "https://github.com/ash-project/ash", "vendor": "ash-project", "versions": [{"lessThan": "3.32.2", "status": "affected", "version": "2.14.18", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Ash.Type.Union'"], "packageName": "ash-project/ash", "packageURL": "pkg:github/ash-project/ash", "product": "ash", "programFiles": ["lib/ash/type/union.ex"], "programRoutines": [{"name": "'Elixir.Ash.Type.Union':dump_to_native/2"}], "repo": "https://github.com/ash-project/ash", "vendor": "ash-project", "versions": [{"lessThan": "8dbdaecd0f115f52e7c3f9a3e798617d6fbf5f7d", "status": "affected", "version": "b0bd2d23d979e731610327636f51da4981fcef68", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.32.2", "versionStartIncluding": "2.14.18", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "remediation developer", "value": "Zach Daniel / Ash Project"}, {"lang": "en", "type": "coordinator", "value": "Jonatan M\u00e4nnchen / EEF"}, {"lang": "en", "type": "reporter", "value": "Peter Ullrich"}, {"lang": "en", "type": "finder", "value": "Peter Ullrich"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Improper Validation of Specified Type of Input vulnerability in ash-project ash lets an attacker confuse the stored type tag of an <code>Ash.Type.Union</code> value that uses <code>storage: :map_with_tag</code>, bypassing that member's validation and any tag-based authorization.</p>\n<p>For a union with <code>storage: :map_with_tag</code>, each member is identified in storage by a configured <code>tag</code> and <code>tag_value</code>. <code>Ash.Type.Union.dump_to_native/2</code> (<code>lib/ash/type/union.ex</code>) did not force the configured tag when writing the value, so a tag carried in the submitted value was persisted verbatim. 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An attacker can therefore store a value whose data belongs to one member but whose tag names a different member. On read the value is re-selected by its tag and treated as the incompatible member (a type confusion), bypassing the real member's constraints and any logic or policy that branches on the union tag. 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