Severity
7.1HIGHNVD
EPSS
0.0%
top 90.26%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 20

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 ex

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:LExploitability: 1.6 | Impact: 5.5

Affected Packages2 packages

CVEListV5nodejs/node4.04.*+18
Debiannodejs/nodejs< 20.19.2+dfsg-1+deb13u1+1

🔴Vulnerability Details

3
GHSA
GHSA-9jwr-p39p-hwg2: A flaw in Node2026-01-20
CVEList
CVE-2025-55131: A flaw in Node2026-01-20
OSV
CVE-2025-55131: A flaw in Node2026-01-20

📋Vendor Advisories

2
Red Hat
nodejs: Nodejs uninitialized memory exposure2026-01-20
Debian
CVE-2025-55131: nodejs - A flaw in Node.js's buffer allocation logic can expose uninitialized memory when...2025

🕵️Threat Intelligence

1
Wiz
CVE-2025-55131 Impact, Exploitability, and Mitigation Steps | Wiz
CVE-2025-55131 — Classic Buffer Overflow in Nodejs Node | cvebase