CVE WatchJul 15, 2026

CVE-2025-55131

A flaw in Node.js's buffer allocation logic can expose uninitialized memory when allocations are interrupted, when using the `vm` module wit

CVSS

7.1

High

EPSS

3.5%

p88

KEV

—

Exploit Today

0-100

Published: Jan 20, 2026 · Last modified: Jul 15, 2026 · CWE-120 · CWE-497

EPSS · 30d

3.5%EPSS · 30 days3.5%

2026-06-302026-07-16

Technical description

A flaw in Node.js's buffer allocation logic can expose uninitialized memory when allocations are interrupted, when using the `vm` module with the timeout option. Under specific timing conditions, buffers allocated with `Buffer.alloc` and other `TypedArray` instances like `Uint8Array` may contain leftover data from previous operations, allowing in-process secrets like tokens or passwords to leak or causing data corruption. While exploitation typically requires precise timing or in-process code execution, it can become remotely exploitable when untrusted input influences workload and timeouts, leading to potential confidentiality and integrity impact.

Official references

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