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CVE-2026-48593

📛 CVE Title

Unbounded range expansion in cron describe causes memory exhaustion in oban_web

⬇ Download JSON ⚠ View as Threat

Description

Uncontrolled Resource Consumption vulnerability in oban-bg oban_web ('Elixir.Oban.Web.CronExpr' modules) allows memory exhaustion via unbounded cron range expansion. An 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. This issue affects oban_web: from 2.12.0 before 2.12.5.

Overview

State
PUBLISHED
Assigner (CNA)
EEF
CVSS severity
MEDIUM
CVSS score
CVSS 5.9 / 10 5.9 5.9 / 10
CVSS 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
Effective score
5.9 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-400
Reserved
2026-05-22
Published
2026-05-26 19:46 UTC
Last updated
2026-05-27 15:40 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/48xxx/CVE-2026-48593.json
Linked Threat
CVE-2026-48593 — CVE-2026-48593

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-26 21:16:41 UTC
NVD last modified
2026-07-24 11:10:00 UTC
EPSS score
0.0042 (probability of exploitation in next 30 days)
EPSS percentile
34.19% vs all CVEs — higher = more likely to be exploited, as of 2026-07-26

NVD / KEV / EPSS data refreshed 2026-07-27 11:02 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-31974
Assigner
EEF
Published
May 26, 2026, 7:46:43 PM
Updated
May 27, 2026, 3:40:57 PM
EUVD base score (CVSS 4.0)
5.9 / 10
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
EUVD-reported EPSS
0.4200
Vendors
oban-bg
Products
oban_web (a97c7960bb389b05aaab4cf8042985f02ceddc24 <9998b7e284e02fdd4645dd6231760038e63b584d)
oban_web (2.12.0 <2.12.5)
Aliases
GHSA-6xh2-93p9-vqh4

ENISA description: Uncontrolled Resource Consumption vulnerability in oban-bg oban_web ('Elixir.Oban.Web.CronExpr' modules) allows memory exhaustion via unbounded cron range expansion. An 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. This issue affects oban_web: from 2.12.0 before 2.12.5.

EUVD references (4)

Affected products (2)
VendorProductVersionsPlatforms
oban-bg oban_web 2.12.0 (affected) —
oban-bg oban_web a97c7960bb389b05aaab4cf8042985f02ceddc24 (affected) —

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

Web references (7)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (17)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-48593.json.

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