CVE-2026-40170: ngtcp2 has a qlog transport parameter serialization stack buffer overflow

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-05-05

EPSS Score

0.05% (percentile: 15.2%)

Affected Products (3)

Other

• 21130-17086
• 21251-17084

Open Source Software

• azl3 nodejs24 24.14.1-2 on Azure Linux 3.0

Revision History

• 2026-05-05: Information published.