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CVE-2026-100723— vm2 before 3.12.2 Memory Disclosure via zlib Buffer Pool

Quick assessment

Affected
patriksimek vm2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 vm2 版本低于 3.12.2 的情况下，该库未对其 Buffer 的底层存储所有权不变量（即 byteOffset 必须为 0，且 buffer.byteLength 必须等于 length）进行强制实施，特别是当这些 Buffer 是从主机内置模块返回时。 如果应用程序通过 NodeVM 的内置模块白名单（例如 require: { builtin: ['zlib'] }）显式暴露了 Node.js 的 zlib 模块，那么 zlib.deflateSync 函数可能返回一个由 Node.js 共享的小缓冲

CVSS 7.5 · High EPSS 0.32% · P22
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I. Basic Information for CVE-2026-100723

Vulnerability Information
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Vulnerability Title
vm2 before 3.12.2 Memory Disclosure via zlib Buffer Pool
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
patriksimek vm2 0 ~ 3.12.2 -

II. Public POCs for CVE-2026-100723

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III. Intelligence Information for CVE-2026-100723

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Vendor Advisories for CVE-2026-100723 (1)

Other References for CVE-2026-100723 (3)

Same Patch Batch · patriksimek · 2026-09-27 · 3 CVEs total

CVE-2026-100721 9.0 CRITICAL vm2 before 3.12.2 Authorization Bypass via Custom Resolver
CVE-2026-100722 6.8 MEDIUM vm2 before 3.12.2 Host Process Termination via Construct Trap

IV. Related Vulnerabilities

Same product: vm2
Same vendor: patriksimek
Same weakness: CWE-200

V. Comments for CVE-2026-100723

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