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CVE-2026-48593— Unbounded range expansion in cron describe causes memory exhaustion in oban_web

Quick assessment

Affected
oban-bg oban_web
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Oban Web是Oban Framework开源的一个嵌入式实时后台任务监控仪表盘。 Oban Web 2.12.0版本至2.12.5之前版本存在安全漏洞，该漏洞源于Elixir.Oban.Web.CronExpr模块中cron范围扩展无限制，可能导致内存耗尽。

AI Predicted 7.5 Difficulty: Easy EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
oban-bg oban_web 2.12.0< 2.12.5 affected
a97c7960bb389b05aaab4cf8042985f02ceddc24< 9998b7e284e02fdd4645dd6231760038e63b584d affected
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I. Basic Information for CVE-2026-48593

Vulnerability Information
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Vulnerability Title
Unbounded range expansion in cron describe causes memory exhaustion in oban_web
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Oban Web 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Oban Web是Oban Framework开源的一个嵌入式实时后台任务监控仪表盘。 Oban Web 2.12.0版本至2.12.5之前版本存在安全漏洞，该漏洞源于Elixir.Oban.Web.CronExpr模块中cron范围扩展无限制，可能导致内存耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
oban-bg oban_web 2.12.0 ~ 2.12.5 cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*
oban-bg oban_web a97c7960bb389b05aaab4cf8042985f02ceddc24 ~ 9998b7e284e02fdd4645dd6231760038e63b584d cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-48593

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III. Intelligence Information for CVE-2026-48593

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Patches & Fixes for CVE-2026-48593 (1)

Vendor Advisories for CVE-2026-48593 (3)

IV. Related Vulnerabilities

Same product: oban_web
Same vendor: oban-bg
Same weakness: CWE-400

V. Comments for CVE-2026-48593

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