CVE-2026-92949

vm2 3.9.6 before 3.11.7 Sandbox Bypass via Accessor Descriptor

At a glance

Severity: MEDIUM 6.3
EPSS: EPSS 0.32 % · percentile 25 (2026-10-27)
State: PUBLISHED
Published: 2026-09-17
Updated: 2026-09-21
Assigner: VulnCheck
NVD status: Deferred

Description

vm2 versions from 3.9.6 before 3.11.7 fail to properly restrict access to accessor properties on frozen objects, allowing sandboxed scripts to bypass vm.freeze() and vm.readonly() protections. Attackers can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to extract and invoke host object setters directly, mutating properties the embedder explicitly marked read-only.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N	VulnCheck
CVSS 3.1	MEDIUM 4.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N	VulnCheck
CVSS 4.0	MEDIUM 6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 4.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N	NVD · disclosure@vulncheck.com (Secondary)

Weaknesses (CWE)

CWE-471

Advisories

GHSA-633r-hq9m-c4ff — vm2: vm.freeze()/vm.readonly() bypass via accessor descriptor

European references

ENISA EUVD · EUVD-2026-81598
GCVE · GCVE-0-2026-92949

Affected products

Product	Versions
patriksimek · vm2	affected 3.9.6 < 3.11.7 ; unaffected 3.11.7

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD