{"id":"CVE-2026-48593","aliases":["EEF-CVE-2026-48593","GHSA-6xh2-93p9-vqh4"],"url":"https://o3.security/vulnerability/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.","published":"2026-05-26T19:46:43.980Z","modified":"2026-08-12T03:51:28.508065961Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Hex","name":"oban_web","fixedVersion":"2.12.5"}],"fix":{"url":"https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d","label":"oban-bg/oban_web@9998b7e"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.508065961Z"}}