What is CVE-2026-92958?

CVE-2026-92958 is vm2 before 3.11.7 Denylist Bypass via fs/promises. The supplied enrichment data classifies it as Privilege Esc mapped to CWE-269 Improper Privilege Management.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Active exploitation is not confirmed from current sources for CVE-2026-92958. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-92958 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

1 public PoC repositories reported; 0 marked weaponized in current dataset. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS, EDR process telemetry, host service logs where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-92958 using CVSS 8.5, EPSS 0%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Prioritize based on EPSS, PoC availability, and external exposure. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

highPrivilege Escpublic exploit

CVE-2026-92958

CVE-2026-92958 — vm2 before 3.11.7 Denylist Bypass via fs/promises

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.

Published Sep 17, 2026Updated Sep 17, 2026Sources: NVD, patriksimek (CNA), GitHub, GitHub Security Advisory, Red Hat (VEX), SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Exploit code

public exploit, none observed

EPSS

ahead of 0% of scored CVEs

Affects

patriksimek

2 products listed

CVSS base

8.5

high · 2 sources

Remediation

The vendor's own words where we have them.

Upgrade vm2 to a fixed release (3.11.7). Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

Red Hat VEX · CVE-2026-92958

fixed0affected5not affected0

workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, appli…

none_available: Affected

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Prioritize based on EPSS, PoC availability, and external exposure.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
patriksimek	vm2	0 to < 3.11.7	Vulnerable
patriksimek	vm2	3.11.7	Patched

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

Low

Confidentiality

None

Integrity

High

Scope

Changed

Attack Complexity

Low

Attack Vector

Network

Privileges Req

Low

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
8.5	CVSS 3.1	high	3.1	4.7	NVD, patriksimek (CNA), GHSA, Red Hat (VEX)
8.4	CVSS 4.0	high	—	—	patriksimek (CNA)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-269 · Improper Privilege Management

Gain Privileges or Assume Identity::

Mitigation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

Weakness & attack patterns

CWE-269Improper Privilege Management

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-122 · Privilege AbuseCAPEC-58 · Restful Privilege ElevationCAPEC-233 · Privilege Escalation

T1548Abuse Elevation Control Mechanism

Public exploit

Capability, not use: code existing is a different claim from anyone running it.

Repositories

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Search application, proxy, and WAF logs for requests touching /builtin.js, /promises, /promises'), /promises')).
Prioritize edge telemetry for network-reachable vm2.
Review endpoint telemetry for service binary replacement, suspicious service launches, or privilege changes tied to the affected agent.
Monitor for scanner or exploit-pattern traffic after 1 public PoC repositories were reported.

web/proxy/WAF logsapplication logsnetwork IDS/IPSEDR process telemetryhost service logs

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 8.5 (AV:N)
Sep 17, 2026 · NVD
Initial · CVE published
Sep 17, 2026 · NVD
Added · GHSA-7c3p-84r8-h79q published (high)
Sep 17, 2026 · GitHub Security Advisory
CVE published by MITRE.
Sep 17, 2026 · SOCRadar CTI

References

7 on the record

github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh
Exploit, Third Party Advisory, Mitre
www.vulncheck.com/advisories/vm2-before-3.11.7-denylist-bypass-via-fs-promises
Vendor Advisory, Mitre
nvd.nist.gov/vuln/detail/CVE-2026-92958
NVD
github.com/advisories/GHSA-7c3p-84r8-h79q
Exploit, Third Party Advisory
access.redhat.com/security/cve/CVE-2026-92958
Vendor Advisory
bugzilla.redhat.com/show_bug.cgi?id=2536039
Vendor Advisory
www.cve.org/CVERecord?id=CVE-2026-92958
Vendor Advisory

Elsewhere on this site

patriksimekevery CVE for this vendor
Privilege Escsame class
CWE-269other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-92958 is vm2 before 3.11.7 Denylist Bypass via fs/promises, a high vulnerability affecting vm2 from patriksimek. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-92958. Public exploit evidence is: 1 public PoC repositories reported; 0 marked weaponized in current dataset. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 8.5 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.