CVE-2026-48593
Unbounded range expansion in cron describe causes memory exhaustion in oban_web
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.
INFO
Published Date :
May 26, 2026, 9:16 p.m.
Last Modified :
July 24, 2026, 11:10 a.m.
Remotely Exploit :
Yes !
Source :
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | ||||
| CVSS 4.0 | MEDIUM | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Solution
- Update oban_web to version 2.12.5 or later.
- Apply relevant security patches provided by the vendor.
- Monitor system resource utilization after updates.
- Validate cron expression parsing logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48593.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48593 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48593
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48593 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48593 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Changed Translation Title: oban_web de oban-bg, Description: Vulnerabilidad de consumo de recursos no controlado en oban-bg oban_web (módulos 'Elixir.Oban.Web.CronExpr') permite el agotamiento de la memoria a través de la expansión ilimitada del rango cron. Un atacante con acceso para programar trabajos cron puede enviar una expresión cron maliciosa como '0 0 1-100000000 * *'. Cuando un usuario con acceso al panel de control ve la lista de trabajos cron, se llama a 'Elixir.Oban.Web.CronExpr':describe/1 para renderizar la expresión. parse_range/1 analiza ambos puntos finales del rango a través de Integer.parse/1 sin verificación de límites, y los ayudantes posteriores expand_dom_parts/1 y expand_dow_parts/1 materializan el rango de forma ávida a través de Enum.to_list/1, causando una asignación de ~2.4 GB y el estancamiento o caída del nodo BEAM. Un ayudante hermano extract_dom_values ya valida los límites del rango, pero los ayudantes de expansión no lo hacen. Este problema afecta a oban_web: desde 2.12.0 antes de 2.12.5. Title: oban_web de oban-bg, Description: Vulnerabilidad de consumo de recursos no controlado en oban-bg oban_web (módulos 'Elixir.Oban.Web.CronExpr') permite el agotamiento de la memoria a través de la expansión ilimitada del rango cron. Un atacante con acceso para programar trabajos cron puede enviar una expresión cron maliciosa como '0 0 1-100000000 * *'. Cuando un usuario con acceso al panel de control ve la lista de trabajos cron, se llama a 'Elixir.Oban.Web.CronExpr':describe/1 para renderizar la expresión. parse_range/1 analiza ambos puntos finales del rango a través de Integer.parse/1 sin verificación de límites, y los ayudantes posteriores expand_dom_parts/1 y expand_dow_parts/1 materializan el rango de forma ávida a través de Enum.to_list/1, causando una asignación de ~2.4 GB y el estancamiento o caída del nodo BEAM. Un ayudante hermano extract_dom_values ya valida los límites del rango, pero los ayudantes de expansión no lo hacen. Este problema afecta a oban_web: desde 2.12.0 antes de 2.12.5. -
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: oban_web de oban-bg, Description: Vulnerabilidad de consumo de recursos no controlado en oban-bg oban_web (módulos 'Elixir.Oban.Web.CronExpr') permite el agotamiento de la memoria a través de la expansión ilimitada del rango cron. Un atacante con acceso para programar trabajos cron puede enviar una expresión cron maliciosa como '0 0 1-100000000 * *'. Cuando un usuario con acceso al panel de control ve la lista de trabajos cron, se llama a 'Elixir.Oban.Web.CronExpr':describe/1 para renderizar la expresión. parse_range/1 analiza ambos puntos finales del rango a través de Integer.parse/1 sin verificación de límites, y los ayudantes posteriores expand_dom_parts/1 y expand_dow_parts/1 materializan el rango de forma ávida a través de Enum.to_list/1, causando una asignación de ~2.4 GB y el estancamiento o caída del nodo BEAM. Un ayudante hermano extract_dom_values ya valida los límites del rango, pero los ayudantes de expansión no lo hacen. Este problema afecta a oban_web: desde 2.12.0 antes de 2.12.5. -
CVE Modified by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*'], 'vendor': 'oban-bg', 'modules': ["'Elixir.Oban.Web.CronExpr'"], 'product': 'oban_web', 'versions': [{'status': 'affected', 'version': '2.12.0', 'lessThan': '2.12.5', 'versionType': 'semver'}], 'packageURL': 'pkg:hex/oban_web', 'packageName': 'oban_web', 'programFiles': ['lib/oban/web/cron_expr.ex'], 'collectionURL': 'https://repo.hex.pm', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Oban.Web.CronExpr':describe/1"}, {'name': "'Elixir.Oban.Web.CronExpr':parse_range/1"}, {'name': "'Elixir.Oban.Web.CronExpr':expand_dom_parts/1"}, {'name': "'Elixir.Oban.Web.CronExpr':expand_dow_parts/1"}]}, {'cpes': ['cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/oban-bg/oban_web.git', 'vendor': 'oban-bg', 'modules': ["'Elixir.Oban.Web.CronExpr'"], 'product': 'oban_web', 'versions': [{'status': 'affected', 'version': 'a97c7960bb389b05aaab4cf8042985f02ceddc24', 'lessThan': '9998b7e284e02fdd4645dd6231760038e63b584d', 'versionType': 'git'}], 'packageURL': 'pkg:github/oban-bg/oban_web', 'packageName': 'oban-bg/oban_web', 'programFiles': ['lib/oban/web/cron_expr.ex'], 'collectionURL': 'https://github.com', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Oban.Web.CronExpr':describe/1"}, {'name': "'Elixir.Oban.Web.CronExpr':parse_range/1"}, {'name': "'Elixir.Oban.Web.CronExpr':expand_dom_parts/1"}, {'name': "'Elixir.Oban.Web.CronExpr':expand_dow_parts/1"}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48593', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-26T20:46:18.908875Z'} -
New CVE Received by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
May. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-400 Added Reference https://cna.erlef.org/cves/CVE-2026-48593.html Added Reference https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d Added Reference https://github.com/oban-bg/oban_web/security/advisories/GHSA-6xh2-93p9-vqh4 Added Reference https://osv.dev/vulnerability/EEF-CVE-2026-48593