CVE-2025-55131

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering.

Exploit odds

3.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-01-20 21:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-15 02:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.5% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2026-01-20 21:16 UTC

Last modified

2026-07-15 02:17 UTC

Exploit probability

3.5% · EPSS, next 30 days

Weakness

CWE-120 · Classic buffer overflow

Record status

Deferred

Attack profile CVSS 3.1 · 7.1

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-55131.md and follow it. Check whether this project is affected by CVE-2025-55131. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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