CVE-2026-48593 (GCVE-0-2026-48593)
Vulnerability from cvelistv5 – Published: 2026-05-26 19:46 – Updated: 2026-05-27 15:40
VLAI
EPSS
VEX
Title
Unbounded range expansion in cron describe causes memory exhaustion in oban_web
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 20:46 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/oban-bg/oban_web/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-48593.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-48593 | related |
| https://github.com/oban-bg/oban_web/commit/9998b7… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| oban-bg | oban_web |
Affected:
2.12.0 , < 2.12.5
(semver)
cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:* |
||
| oban-bg | oban_web |
Affected:
a97c7960bb389b05aaab4cf8042985f02ceddc24 , < 9998b7e284e02fdd4645dd6231760038e63b584d
(git)
cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:* |
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"lessThan": "2.12.5",
"status": "affected",
"version": "2.12.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Oban.Web.CronExpr\u0027"
],
"packageName": "oban-bg/oban_web",
"packageURL": "pkg:github/oban-bg/oban_web",
"product": "oban_web",
"programFiles": [
"lib/oban/web/cron_expr.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Oban.Web.CronExpr\u0027:describe/1"
},
{
"name": "\u0027Elixir.Oban.Web.CronExpr\u0027:parse_range/1"
},
{
"name": "\u0027Elixir.Oban.Web.CronExpr\u0027:expand_dom_parts/1"
},
{
"name": "\u0027Elixir.Oban.Web.CronExpr\u0027:expand_dow_parts/1"
}
],
"repo": "https://github.com/oban-bg/oban_web.git",
"vendor": "oban-bg",
"versions": [
{
"lessThan": "9998b7e284e02fdd4645dd6231760038e63b584d",
"status": "affected",
"version": "a97c7960bb389b05aaab4cf8042985f02ceddc24",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe vulnerability is exploitable when an attacker with access to schedule cron jobs submits a malicious cron expression. The crash is triggered when a user with dashboard access views the cron job list, which calls \u003ctt\u003e\u0027Elixir.Oban.Web.CronExpr\u0027:describe/1\u003c/tt\u003e to render the expression.\u003c/p\u003e"
}
],
"value": "The vulnerability is exploitable when an attacker with access to schedule cron jobs submits a malicious cron expression. The crash is triggered when a user with dashboard access views the cron job list, which calls \u0027Elixir.Oban.Web.CronExpr\u0027:describe/1 to render the expression."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:oban_web_project:oban_web:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.12.5",
"versionStartIncluding": "2.12.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Shannon Selbert"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUncontrolled Resource Consumption vulnerability in oban-bg oban_web (\u003ctt\u003e\u0027Elixir.Oban.Web.CronExpr\u0027\u003c/tt\u003e modules) allows memory exhaustion via unbounded cron range expansion.\u003c/p\u003e\u003cp\u003eAn attacker with access to schedule cron jobs can submit a malicious cron expression such as \u003ctt\u003e\"0 0 1-100000000 * *\"\u003c/tt\u003e. When a user with dashboard access views the cron job list, \u003ctt\u003e\u0027Elixir.Oban.Web.CronExpr\u0027:describe/1\u003c/tt\u003e is called to render the expression. \u003ctt\u003eparse_range/1\u003c/tt\u003e parses both range endpoints via \u003ctt\u003eInteger.parse/1\u003c/tt\u003e with no bounds check, and the downstream helpers \u003ctt\u003eexpand_dom_parts/1\u003c/tt\u003e and \u003ctt\u003eexpand_dow_parts/1\u003c/tt\u003e materialise the range eagerly via \u003ctt\u003eEnum.to_list/1\u003c/tt\u003e, causing allocation of ~2.4 GB and stalling or crashing the BEAM node. A sibling helper \u003ctt\u003eextract_dom_values\u003c/tt\u003e already validates range bounds, but the expansion helpers do not.\u003c/p\u003e\u003cp\u003eThis issue affects oban_web: from 2.12.0 before 2.12.5.\u003c/p\u003e"
}
],
"value": "Uncontrolled Resource Consumption vulnerability in oban-bg oban_web (\u0027Elixir.Oban.Web.CronExpr\u0027 modules) allows memory exhaustion via unbounded cron range expansion.\n\nAn 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, \u0027Elixir.Oban.Web.CronExpr\u0027: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.\n\nThis issue affects oban_web: from 2.12.0 before 2.12.5."
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400 Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T15:40:57.317Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/oban-bg/oban_web/security/advisories/GHSA-6xh2-93p9-vqh4"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-48593.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-48593"
},
{
"tags": [
"patch"
],
"url": "https://github.com/oban-bg/oban_web/commit/9998b7e284e02fdd4645dd6231760038e63b584d"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Unbounded range expansion in cron describe causes memory exhaustion in oban_web",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-48593",
"datePublished": "2026-05-26T19:46:43.980Z",
"dateReserved": "2026-05-22T09:36:56.834Z",
"dateUpdated": "2026-05-27T15:40:57.317Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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