Is CVE-2026-40879 actively exploited?

CVE-2026-40879 has no public evidence of in-the-wild exploitation as of 2026-04-24.

What is the CVSS score for CVE-2026-40879?

CVE-2026-40879 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2026-40879?

Patch guidance is available from nestjs security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40879.

Fix CVE-2026-40879 - HIGH nestjs nest

Description

Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.19, when an attacker sends many small, valid JSON messages in one TCP frame, handleData() recurses once per message; the buffer shrinks each call. maxBufferSize is never reached; call stack overflows instead. A ~47 KB payload is sufficient to trigger RangeError. This vulnerability is fixed in 11.1.19.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-674

Metadata

Primary Vendor: NESTJS
Published: 4/21/2026
Last Modified: 4/24/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-40879

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary