{"id":"EEF-CVE-2026-67585","summary":"Atom Exhaustion via _entities Representation Keys in DivvyPayHQ absinthe_federation","details":"## Summary\n\nAllocation of Resources Without Limits or Throttling vulnerability in DivvyPayHQ absinthe_federation allows an unauthenticated remote attacker to abort the Erlang VM via crafted `_entities` representation keys.\n\nEvery key of every object in the `representations` argument of the federation-mandated `_entities` field is converted with `String.to_atom/1` by `convert_key/2` in `lib/absinthe/federation/schema/entities_field.ex`. `representations` is typed as the open-ended `_Any` scalar, so its keys bypass schema coercion and the attacker names them freely. Atoms are never garbage collected and the BEAM atom table is hard-capped (about 1,048,576 entries by default), so one request carrying tens of thousands of unique keys creates that many permanent atoms and a handful of such requests exhausts the table and aborts the node. The impact is confined to availability: no data is read or altered, and recovery requires restarting the application.\n\nThis issue affects absinthe_federation: from 0.1.0 before 0.9.3.","aliases":["CVE-2026-67585","GHSA-55hv-mwvr-phf3"],"modified":"2026-09-08T08:15:05.559137237Z","published":"2026-08-07T16:42:22.653Z","database_specific":{"cwe_ids":["CWE-770"],"capec_ids":["CAPEC-130"],"cpe_ids":["cpe:2.3:a:divvypayhq:absinthe_federation:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/DivvyPayHQ/absinthe_federation/security/advisories/GHSA-55hv-mwvr-phf3"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-67585.html"},{"type":"FIX","url":"https://github.com/DivvyPayHQ/absinthe_federation/commit/c3838cda2a7f65c4893291668c223b0d6acf4516"},{"type":"PACKAGE","url":"https://hex.pm/packages/absinthe_federation"}],"affected":[{"package":{"name":"absinthe_federation","ecosystem":"Hex","purl":"pkg:hex/absinthe_federation"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.1.0"},{"fixed":"0.9.3"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.1.7","0.1.8","0.1.9","0.2.0","0.2.1","0.2.2","0.2.3","0.2.4","0.2.5","0.2.51","0.2.52","0.2.53","0.3.0","0.3.1","0.3.2","0.4.0","0.4.1","0.4.2","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.6.0","0.6.1","0.7.0","0.7.1","0.8.0","0.9.0","0.9.1","0.9.2"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-67585.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/DivvyPayHQ/absinthe_federation","events":[{"introduced":"640a234a26b2d6fe5d9d21e00e5f4fce5645c0bf"},{"fixed":"c3838cda2a7f65c4893291668c223b0d6acf4516"}]}],"versions":["v0.9.2","v0.9.1","v0.9.0","v0.8.0","v0.7.1","v0.7.0","v0.6.1","v0.6.0","v0.5.4","v0.5.3","v0.5.2","v0.5.0","v0.4.2","v0.4.1","v0.3.2","v0.3.1","v0.3.0","v0.2.53","v0.2.52","v0.2.51","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.9","v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-67585.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Doruk Gurleyen","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}]}