CVE-2026-93603
vm2: vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function
Severity by source
Trivy's own label is CRITICAL. Rated critical by Red Hat.
Description
vm2 through 3.12.0 (fixed in 3.12.1) does not correctly handle a nullish `this` receiver in the apply trap of its bridge (lib/bridge.js): when sandboxed code calls a host-provided non-strict (sloppy-mode) function without a receiver — e.g. `fn()`, a detached method, `fn.call()`, `fn.apply(undefined)`, `Reflect.apply(fn, undefined, [])`, or `fn.bind()()` — the undefined receiver is passed straight through to the host call, and V8 substitutes the host realm's global object for `this`. vm2 then wraps and returns that object to the sandbox, giving sandboxed script a live proxy of the host global. This allows a complete sandbox escape: untrusted script can reach `process` and execute arbitrary code/commands on the host (for example via `process.getBuiltinModule('child_process').execSync`). Exploitation requires that the embedding application expose at least one non-strict host function to the sandbox; strict-mode and ES module host functions are not affected.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| seal npm::Seal Security Database | @seal-security/vm2, vm2 | 3.9.11-sp999, 3.9.12-sp999, 3.9.13-sp999, 3.9.14-sp999 |
Show all 2 entries from 1 source
| Source | Package | Fixed in |
|---|---|---|
| seal npm::Seal Security Database | @seal-security/vm2 | 3.9.11-sp999, 3.9.12-sp999, 3.9.13-sp999, 3.9.14-sp999 |
| seal npm::Seal Security Database | vm2 | 3.9.11-sp999, 3.9.12-sp999, 3.9.13-sp999, 3.9.14-sp999 |
References
- https://access.redhat.com/security/cve/CVE-2026-93603
- https://github.com/patriksimek/vm2/security/advisories/GHSA-j89j-5m6r-cr2q
- https://nvd.nist.gov/vuln/detail/CVE-2026-93603
- https://www.cve.org/CVERecord?id=CVE-2026-93603
- https://www.vulncheck.com/advisories/vm2-before-3.12.1-sandbox-escape-rce-via-non-strict-host-function