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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.