{"id":"CVE-2026-94201","revision":null,"records":[{"revision":"390bbf2f456e485498070b29b261c2dd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-94201","aliases":[],"title":"Filtering an :atom attribute with unsafe_to_atom? can exhaust the BEAM atom table in Ash","description":"Ash stores :atom-typed attributes as strings and compares them as strings. When such an attribute is referenced in a filter, the comparison value is coerced through Ash.Type.Atom. Because the type defined no coerce/2 callback, coercion fell back to the default (cast_input/2), which calls String.to_atom/1 when the attribute is configured with the unsafe_to_atom?: true constraint.\n\nFiltering such an attribute with attacker-controlled strings therefore interned a new, permanent atom for every distinct value. Atoms are never garbage collected and the BEAM caps the atom table, so an actor who can supply filter values for a public, filterable :atom attribute declared with unsafe_to_atom?: true can exhaust the atom table and crash the node (denial of service). AshPaperTrail is a notable example: its version resources expose a public, filterable version_action_name atom attribute with unsafe_to_atom?: true by default.\n\nThe fix adds a coerce/2 to Ash.Type.Atom that never interns atoms — a comparison value is left as a string, since the type is stored and compared as a string. Setting the attribute from action input (cast_input/2, which still honors unsafe_to_atom?) is unchanged.\n\nThis issue affects ash: from 3.5.1 before 3.34.3.","state":0,"publishedAt":"2026-10-05T19:19:51.326+00:00","modifiedAt":"2026-10-06T13:41:22.142+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"ash","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Ash.Type.Atom'\"\n                    ],\n                    \"packageName\": \"ash\",\n                    \"packageURL\": \"pkg:hex/ash\",\n                    \"product\": \"ash\",\n                    \"programFiles\": [\n                        \"lib/ash/type/atom.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Ash.Type.Atom':cast_value/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/ash-project/ash\",\n                    \"vendor\": \"ash-project\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.34.3\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.5.1\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"ash-project/ash","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Ash.Type.Atom'\"\n                    ],\n                    \"packageName\": \"ash-project/ash\",\n                    \"packageURL\": \"pkg:github/ash-project/ash\",\n                    \"product\": \"ash\",\n                    \"programFiles\": [\n                        \"lib/ash/type/atom.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Ash.Type.Atom':cast_value/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/ash-project/ash\",\n                    \"vendor\": \"ash-project\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"5282f3f513053628cdd1bf2236ea22d975d934d4\",\n                            \"status\": \"affected\",\n                            \"version\": \"2970ba3bd5d36d6ad04c731ac87385375d457147\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2,"severity":"HIGH"}],"references":["https://cna.erlef.org/cves/CVE-2026-94201.html","https://osv.dev/vulnerability/EEF-CVE-2026-94201","https://github.com/ash-project/ash/commit/2970ba3bd5d36d6ad04c731ac87385375d457147","https://github.com/ash-project/ash/commit/5282f3f513053628cdd1bf2236ea22d975d934d4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-94201","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-94201","identifiers":["CVE-2026-94201"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-11T14:57:42.7555955+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-11T14:57:42.7555955+00:00","lastSuccessAt":"2026-11-11T14:57:42.9319568+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.9319577+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-de3b77103708811b6494d2ff7c979037d73ae579742cd1649a5c765137ae5083-19109df301f45af5f6ac2ef04012c27245f9ad888d1e548bcdb48fe76d9f96e6","complete":true,"records":424146,"lastAttemptAt":"2026-11-11T14:57:42.3158203+00:00","lastSuccessAt":"2026-11-11T14:57:42.1205118+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.3158203+00:00","snapshotPublishedAt":"2026-11-11T14:27:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-daa70f0e05b540b28ec429806bdccfc4","complete":false,"records":13759,"lastAttemptAt":"2026-11-11T15:09:37.2726122+00:00","lastSuccessAt":"2026-11-11T15:09:37.269+00:00","error":null,"lastVerifiedAt":"2026-11-11T15:09:37.269+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13582,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T14:57:42.7555955+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T14:57:42.7555955+00:00","lastSuccessAt":"2026-11-11T14:57:42.9331503+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.9331505+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-11785b13898646a1917b06b09d2df4a4","complete":true,"records":13753,"lastAttemptAt":"2026-11-11T14:57:44.6046058+00:00","lastSuccessAt":"2026-11-11T13:57:34.909+00:00","error":null,"lastVerifiedAt":"2026-11-11T13:57:34.909+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T14:57:42.5803744+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.5803744+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T14:57:42.3614093+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.3614093+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-baa8362b4daf9e5f39d5563775a55935e7b442c0735d33274a921579ce4a0d66","complete":true,"records":3093,"lastAttemptAt":"2026-11-11T14:57:42.6953487+00:00","lastSuccessAt":"2026-11-11T13:00:02.5446881+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.6953487+00:00","snapshotPublishedAt":"2026-11-11T12:47:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-10cb353ca77c2a8069d6892d1d394d936b12c0add3c8749e2a1a03a1c5d50426","complete":true,"records":231666,"lastAttemptAt":"2026-11-11T14:57:42.4738411+00:00","lastSuccessAt":"2026-11-11T12:59:55.8981437+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.4738411+00:00","snapshotPublishedAt":"2026-11-11T12:32:53+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}