TI-2026-35949 Aliases CVE-2026-48593 GHSA-6xh2-93p9-vqh4

Unbounded range expansion in cron describe causes memory exhaustion in oban_web

LOW 27CWE-400Published 2026-05-26 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: Present
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00417 36th percentileScored 2026-11-07

Fix Fixed oban_web (oban-bg): 2.12.5oban_web (Hex): 2.12.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
oban-bg	oban_web	2.12.0 to before 2.12.5	2.12.5	Patch available	CNA
—	oban_web (Hex)	2.12.0 to before 2.12.5	2.12.5	Patch available	GHSA-6xh2-93p9-vqh4

oban_web Vendoroban-bg Affected 2.12.0 to before 2.12.5 Fixed in 2.12.5 Patch available CNA
oban_web (Hex) Vendor— Affected 2.12.0 to before 2.12.5 Fixed in 2.12.5 Patch available GHSA-6xh2-93p9-vqh4

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:oban_web_project:oban_web::::::::	—	—	—

cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

Fix · CNA oban_web (oban-bg) Fixed in 2.12.5
Fix · GHSA-6xh2-93p9-vqh4 oban_web (Hex) Fixed in 2.12.5 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-05-26
oban-bg oban_web 2.12.5
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-35948 Missing authorization check on save-job event handler in oban_webPriority LOW 25
Show all 2 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-48593
2026-10-03 Alias added: GHSA-6xh2-93p9-vqh4

References

Patch 1

https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d

Advisory 2

Other 4

TI-2026-35948 Missing authorization check on save-job event handler in oban_web CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences