CVE-2026-92958 (GCVE-0-2026-92958)
Vulnerability from cvelistv5 – Published: 2026-09-17 13:46 – Updated: 2026-09-17 13:46
VLAI
EPSS
VEX
Title
vm2 before 3.11.7 Denylist Bypass via fs/promises
Summary
vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.
Severity
CWE
- CWE-269 - Improper Privilege Management
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/patriksimek/vm2/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/vm2-before-3… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| patriksimek | vm2 |
Affected:
0 , < 3.11.7
(semver)
Unaffected: 3.11.7 (semver) |
guessed |
Date Public
2026-08-24 00:00
{
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}
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"description": "Improper Privilege Management",
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"name": "GitHub Security Advisory (GHSA-6rh5-qq4q-97xh)",
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],
"url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh"
},
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"tags": [
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"title": "vm2 before 3.11.7 Denylist Bypass via fs/promises",
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"cveMetadata": {
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"cveId": "CVE-2026-92958",
"datePublished": "2026-09-17T13:46:15.549Z",
"dateReserved": "2026-09-17T12:43:31.527Z",
"dateUpdated": "2026-09-17T13:46:15.549Z",
"state": "PUBLISHED"
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"nvd": {
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"versions": [
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},
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}
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"cveTags": [],
"descriptions": [
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"value": "vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: [\u0027*\u0027, \u0027-fs\u0027, \u0027-child_process\u0027] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require(\u0027fs/promises\u0027) or require(\u0027node:fs/promises\u0027) and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require(\u0027fs/promises\u0027)). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7."
}
],
"id": "CVE-2026-92958",
"lastModified": "2026-09-17T14:18:02.083",
"metrics": {
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"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
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"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"source": "disclosure@vulncheck.com",
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"published": "2026-09-17T14:18:01.970",
"references": [
{
"source": "disclosure@vulncheck.com",
"url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh"
},
{
"source": "disclosure@vulncheck.com",
"url": "https://www.vulncheck.com/advisories/vm2-before-3.11.7-denylist-bypass-via-fs-promises"
}
],
"sourceIdentifier": "disclosure@vulncheck.com",
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"weaknesses": [
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"description": [
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"value": "CWE-269"
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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-17T16:15:48+00:00",
"cve": "CVE-2026-92958",
"id": "CVE-2026-92958",
"initial_release_date": "2026-09-17T13:46:15.549000+00:00",
"product_status:known_affected": "5",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "vm2: vm2: Sandbox escape via denylist bypass in NodeVM",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92958.json",
"version": "3"
}
}
}
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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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