CVE-2026-18540: undici vulnerable to downstream response splitting via retry interceptor

Overview

Severity

Low (CVSS 3.7)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-09

Last Updated

2026-10-21

EPSS Score

0.24% (percentile: 14.2%)

Affected Products (3)

Other

• 21792-17084
• 21671-17084

Open Source Software

• azl3 nodejs 24.21.0-1 on Azure Linux 3.0

Security Updates (1)

• Security Update

Revision History

• 2026-09-09: Information published.
• 2026-09-09: Information published.
• 2026-09-23: Information published.
• 2026-09-24: Information published.
• 2026-10-18: Information published.
• 2026-10-21: Information published.