CVE Watch1 oct 2026

CVE-2026-100723

vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers

CVSS

7.5

Alto

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Publicado: 27 sept 2026 · Última mod.: 1 oct 2026 · CWE-200

EPSS · 30d

0.3%EPSS · 30 días0.4%

2026-09-272026-10-25

Descripción técnica

vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers returned from host builtin modules. When an application explicitly exposes Node's zlib module through NodeVM's builtin allowlist (require: { builtin: ['zlib'] }), zlib.deflateSync can return a Buffer backed by Node's shared small-buffer pool whose .buffer is the entire pool. Untrusted guest code can construct a full-width view of that ArrayBuffer (Buffer.from(result.buffer, 0, result.buffer.byteLength)) to read and modify bytes belonging to unrelated host buffers, disclosing and corrupting host-realm memory across the sandbox boundary.

Referencias oficiales

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