{"items":[{"id":"NVI-00017495","kind":"vulnerability","title":"oban_web: Unbounded range expansion in cron describe causes memory exhaustion","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6xh2-93p9-vqh4","CVE-2026-48593"],"plain_summary":"GitHub lists this reviewed advisory for oban_web. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0b2a91fdc97cf24a2f1137e1b632b926"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0b2a91fdc97cf24a2f1137e1b632b926","url":"https://github.com/advisories/GHSA-6xh2-93p9-vqh4","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6xh2-93p9-vqh4","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T11:39:31.286Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0b2a91fdc97cf24a2f1137e1b632b926"],"technology":"oban_web","known_exclusions":[],"conditions_summary":"### Summary\n\n`oban_web` 2.12.0 introduced a cron expression parser that expands `-`-separated ranges without validating the endpoints. An attacker with access to schedule cron jobs can submit a malicious expression; when any user with dashboard access views the cron job list, `Oban.Web.CronExpr.describe/1` is called to render it, triggering allocation of gigabytes of memory and stalling or crashing the BEAM node.\n\n### Details\n\n**1. Scheduling:** The attacker submits a cron job with a malicious expression such as `\"0 0 1-100000000 * *\"`. No special privilege is required beyond the ability to schedule cron jobs.\n\n**2. Parsing:** When the cron list is rendered in the dashboard, `describe/1` calls `parse_range/1` in `lib/oban/web/cron_expr.ex`, which calls `Integer.parse/1` on both endpoints of the range with no bounds check, returning `{:range, start_val, end_val}` for any integers.\n\n**3. Eager expansion:** `expand_dom_parts/1` and `expand_dow_parts/1` materialise the range via `Enum.to_list(start_val..end_val)`. The input above produces ~100 million integers (~2.4 GB). A sibling helper `extract_dom_values` already validates range bounds, but the expansion helpers do not.\n\n### PoC\n\n1.","public_affected_ranges":[">= 2.12.0, < 2.12.5"]}],"null_published_at":"2026-11-05T19:10:21.398Z","source_updated_at":"2026-06-30T18:32:50.000Z","source_disclosed_at":"2026-06-30T18:32:49.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T11:39:31.286Z"}],"next_cursor":null,"snapshot_revision":"42594"}