{"id":"CVE-2026-48593","summary":"Unbounded range expansion in cron describe causes memory exhaustion in oban_web","details":"Uncontrolled 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.","aliases":["EEF-CVE-2026-48593","GHSA-6xh2-93p9-vqh4"],"modified":"2026-06-18T03:57:13.670326859Z","published":"2026-05-26T19:46:43.980Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48593.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"a97c7960bb389b05aaab4cf8042985f02ceddc24"},{"fixed":"9998b7e284e02fdd4645dd6231760038e63b584d"}]}]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-48593.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-48593"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48593.json"},{"type":"ADVISORY","url":"https://github.com/oban-bg/oban_web/security/advisories/GHSA-6xh2-93p9-vqh4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48593"},{"type":"FIX","url":"https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d"},{"type":"PACKAGE","url":"https://github.com/oban-bg/oban_web.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/oban-bg/oban_web","events":[{"introduced":"f23d19f035a36430f898c35fcd2168784c427a59"},{"fixed":"a01100b9405fa62009bc1674d5b2bd2acc27e07e"},{"fixed":"9998b7e284e02fdd4645dd6231760038e63b584d"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"2.12.0"},{"fixed":"2.12.5"}]}}],"versions":["v2.12.4","v2.12.3","v2.12.2","v2.12.1","v2.12.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/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"}]}