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HIGH

CVE-2025-55131

CVSS v3

7.1

HIGH

EPSS Score

3.5 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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

Technical details

Published
2026-01-20
Last Modified
2026-04-14

Frequently asked questions

What is 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 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

Is CVE-2025-55131 actively exploited?

Active exploitation of CVE-2025-55131 has not been confirmed. Its EPSS score was 3.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-55131?

CVE-2025-55131 has a CVSS v3 base score of 7.1 (HIGH severity).

Is CVE-2025-55131 affecting your environment?

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