PT-2026-33230 · Nest · Nest

Published 2026-04-14 · Updated 2026-04-21 · CVE-2026-40879

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Nest versions prior to 11.1.19

Description An issue exists where an attacker can send numerous small, valid JSON messages within a single TCP frame. This causes the handleData() function to recurse once for every message, shrinking the buffer with each call. Because maxBufferSize is not reached, the call stack overflows, and a payload of approximately 47 KB is sufficient to trigger a RangeError.

Recommendations Update to version 11.1.19.

Fix

Uncontrolled Recursion

Allocation of Resources Without Limits

Weakness Enumeration

CWE-674

CWE-770

Related Identifiers

CVE-2026-40879

GHSA-HPWF-8G29-85QM

Affected Products

Nest

References · 5

• https://github.com/nestjs/nest/security/advisories/GHSA-hpwf-8g29-85qm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40879 · Security Note
• https://osv.dev/vulnerability/GHSA-hpwf-8g29-85qm · Vendor Advisory
• https://github.com/nestjs/nest · Note
• https://twitter.com/VulmonFeeds/status/2046717811767074823 · Twitter Post