CVE-2026-48593
Deferred Deferred - Pending Action
Memory Exhaustion in Oban Web Cron Expression Parsing

Publication date: 2026-05-26

Last updated on: 2026-05-26

Assigner: EEF

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.
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Meta Information
Published
2026-05-26
Last Modified
2026-05-26
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-14
NVD
CVE-2026-48593
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
oban oban_web to 2.12.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability is an Uncontrolled Resource Consumption issue in the oban_web component of the oban-bg system, specifically in the 'Elixir.Oban.Web.CronExpr' modules.

An attacker who can schedule cron jobs can submit a malicious cron expression with an extremely large range, such as "0 0 1-100000000 * *".

When a user with dashboard access views the cron job list, the system tries to render this expression by expanding the range without proper bounds checking, causing it to allocate a very large amount of memory (~2.4 GB).

This excessive memory allocation can stall or crash the BEAM node (the Erlang virtual machine running the application).

Impact Analysis

The vulnerability can lead to memory exhaustion on the server running the oban_web dashboard.

This can cause the BEAM node to stall or crash, resulting in denial of service for users relying on the application.

An attacker with the ability to schedule cron jobs can exploit this to disrupt normal operations and potentially cause downtime.

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