CVE-2026-26956: VM2 Has a WASM Sandbox Escape

May 5, 2026 (updated June 8, 2026)

Full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation.

References

github.com/advisories/GHSA-ffh4-j6h5-pg66
github.com/patriksimek/vm2/releases/tag/v3.10.5
github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66
nvd.nist.gov/vuln/detail/CVE-2026-26956

Code Behaviors & Features

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