vm2: vm.freeze()/vm.readonly() bypass via accessor descriptor

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• vm2 3.11.7Fixed version · GitHub Advisories · npm package vm2: upgrade to 3.11.7 or later (affected >= 3.9.6, <= 3.11.6)

[ Packages ]Affected open-source packages

• vm2 npmAffected >= 3.9.6, <= 3.11.6 · fixed in 3.11.7 · GHSA-633r-hq9m-c4ff

[ References ]References

• github.com/patriksimek/vm2/security/advisories/GHSA-633r-hq9m-c4ffvendor-advisory
• www.vulncheck.com/advisories/vm2-3.9.6-before-3.11.7-sandbox-bypass-via-accessor-descri…third-party-advisory