What is CVE-2026-18540?

CVE-2026-18540 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. undici vulnerable to downstream response splitting via retry interceptor

Which CVE IDs does CVE-2026-18540 cover?

CVE-2026-18540 covers the following CVE IDs: CVE-2026-18540. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-18540?

CVE-2026-18540 has a CVSS v3 base score of 3.7, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-18540?

CVE-2026-18540 affects 3 products, including: azl3 nodejs 24.18.1-1 on Azure Linux 3.0; azl3 nodejs 24.20.0-1 on Azure Linux 3.0; azl3 nodejs 24.21.0-1 on Azure Linux 3.0.

CVE-2026-18540LowCVSS 3.7

undici vulnerable to downstream response splitting via retry interceptor

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-18540 →

🎯 Affected products3

azl3 nodejs 24.18.1-1 on Azure Linux 3.0
azl3 nodejs 24.20.0-1 on Azure Linux 3.0
azl3 nodejs 24.21.0-1 on Azure Linux 3.0

✅ Remediation

Security Update KBRelease Notes (Security Update) — fixed build 24.22.0-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18540
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade