{"id":"EEF-CVE-2026-48593","summary":"Unbounded range expansion in cron describe causes memory exhaustion in oban_web","details":"## Summary\n\nUncontrolled Resource Consumption vulnerability in oban-bg oban_web ('Elixir.Oban.Web.CronExpr' modules) allows memory exhaustion via unbounded cron range expansion.\n\nAn attacker with access to schedule cron jobs can submit a malicious cron expression such as \"0 0 1-100000000 * *\". When a user with dashboard access views the cron job list, 'Elixir.Oban.Web.CronExpr':describe/1 is called to render the expression. parse_range/1 parses both range endpoints via Integer.parse/1 with no bounds check, and the downstream helpers expand_dom_parts/1 and expand_dow_parts/1 materialise the range eagerly via Enum.to_list/1, causing allocation of ~2.4 GB and stalling or crashing the BEAM node. A sibling helper extract_dom_values already validates range bounds, but the expansion helpers do not.\n\nThis issue affects oban_web: from 2.12.0 before 2.12.5.\n\n## Configuration\n\nThe vulnerability is exploitable when an attacker with access to schedule cron jobs submits a malicious cron expression. The crash is triggered when a user with dashboard access views the cron job list, which calls 'Elixir.Oban.Web.CronExpr':describe/1 to render the expression.","aliases":["CVE-2026-48593","GHSA-6xh2-93p9-vqh4"],"modified":"2026-05-27T16:00:07.184512442Z","published":"2026-05-26T19:46:43.980Z","database_specific":{"cwe_ids":["CWE-400"],"cpe_ids":["cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*"],"capec_ids":["CAPEC-130"]},"references":[{"type":"ADVISORY","url":"https://github.com/oban-bg/oban_web/security/advisories/GHSA-6xh2-93p9-vqh4"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-48593.html"},{"type":"FIX","url":"https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d"},{"type":"PACKAGE","url":"https://hex.pm/packages/oban_web"}],"affected":[{"package":{"name":"oban_web","ecosystem":"Hex","purl":"pkg:hex/oban_web"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.12.0"},{"fixed":"2.12.5"}]}],"versions":["2.12.0","2.12.1","2.12.2","2.12.3","2.12.4"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-48593.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/oban-bg/oban_web.git","events":[{"introduced":"a97c7960bb389b05aaab4cf8042985f02ceddc24"},{"fixed":"9998b7e284e02fdd4645dd6231760038e63b584d"}]}],"versions":["v2.12.4","v2.12.3","v2.12.2","v2.12.1","v2.12.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-48593.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Shannon Selbert","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}]}