CVE-2026-92949Public exploitNetwork attack vectorHinoki check available

Host-object modification via exposed accessor setters

Published Sep 17, 2026 · Updated Sep 21, 2026

Sandbox protection bypass in Patrik Simek vm2 3.9.6 through 3.11.6 allows remote attackers to modify frozen host-object state. Descriptor APIs expose a host setter, and BaseHandler.apply unwraps the read-only proxy before invoking that setter on the raw object. Reachability requires attacker-controlled JavaScript and an exposed host object with an own accessor property; impact is limited to that object's embedder-defined state.

CVSS severity6.3
Medium
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Sandbox protection bypass in Patrik Simek vm2 3.9.6 through 3.11.6 allows remote attackers to modify frozen host-object state. Descriptor APIs expose a host setter, and BaseHandler.apply unwraps the read-only proxy before invoking that setter on the raw object. Reachability requires attacker-controlled JavaScript and an exposed host object with an own accessor property; impact is limited to that object's embedder-defined state.

The record

CVE
CVE-2026-92949
Published
Sep 17, 2026
Updated
Sep 21, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-693, CWE-471
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9.6 <3.11.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Patrik Simek · vm2version=3.9.6 <3.11.7

Published CVSS scores

6.3VulnCheckCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
4.0Patrik SimekCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-471Modification of Assumed-Immutable Data (MAID)

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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