Vulnerability · Published May 4, 2026 · Assigned by GitHub_M
CVE-2026-26956vm2: WASM Sandbox Escape (Node 25 only)
Critical 9.8
In plain English
A critical-severity security flaw in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.1%top 34.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | vm2 | 3.10.5 | GHSA-ffh4-j6h5-pg66 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| patriksimek | vm2 | = 3.10.4 |
Weakness: CWE-693, CWE-653 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66 x_refsource_CONFIRM
- https://github.com/patriksimek/vm2/releases/tag/v3.10.5 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-26956 vdb-entry, x_refsource_REDHAT
- RHBZ#2466548 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26956.json x_sadp-csaf-vex