Unbounded range expansion in cron describe causes memory exhaustion in oban_web_CVE-2026-48593

{
    "lastseen": "",
    "description": "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": "2026-05-26T20:46:24.889Z",
    "type": "cve",
    "title": "Unbounded range expansion in cron describe causes memory exhaustion in oban_web",
    "source": "EEF",
    "references": "https://github.com/oban-bg/oban_web/security/advisories/GHSA-6xh2-93p9-vqh4\nhttps://cna.erlef.org/cves/CVE-2026-48593.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-48593\nhttps://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d",
    "id": "CVE-2026-48593",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400"
    ],
    "cvelist": null,
    "sourceData": "oban-bg oban_web 2.12.0\noban-bg oban_web a97c7960bb389b05aaab4cf8042985f02ceddc24",
    "sourceHref": "",
    "cvss": {
        "score": 5.9,
        "severity": "MEDIUM",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "oban_web",
    "version": "2.12.0",
    "vendor": "oban-bg",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}