What is CVE-2026-43973?

CVE-2026-43973 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. gun HTTP/1.1 response buffer has no size limit allowing server-controlled memory exhaustion

Which CVE IDs does CVE-2026-43973 cover?

CVE-2026-43973 covers the following CVE IDs: CVE-2026-43973. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-43973?

CVE-2026-43973 affects 2 products, including: azl3 rabbitmq-server 3.13.7-5 on Azure Linux 3.0; azl3 rabbitmq-server 3.13.7-6 on Azure Linux 3.0.

CVE-2026-43973Medium

gun HTTP/1.1 response buffer has no size limit allowing server-controlled memory exhaustion

Vendor

Microsoft Security Response Center (MSRC)

Published

June 19, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-43973 →

🎯 Affected products2

azl3 rabbitmq-server 3.13.7-5 on Azure Linux 3.0
azl3 rabbitmq-server 3.13.7-6 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 3.13.7-6

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43973
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade