What is CVE-2026-69186?

CVE-2026-69186 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

Which CVE IDs does CVE-2026-69186 cover?

CVE-2026-69186 covers the following CVE IDs: CVE-2026-69186. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-69186?

CVE-2026-69186 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-69186?

CVE-2026-69186 affects 3 products, including: azl3 c-ares 1.30.0-2 on Azure Linux 3.0; azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0; azl3 fluent-bit 3.1.10-8 on Azure Linux 3.0.

CVE-2026-69186MediumCVSS 5.3

c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

Vendor

Microsoft Security Response Center (MSRC)

Published

September 20, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-69186 →

🎯 Affected products3

azl3 c-ares 1.30.0-2 on Azure Linux 3.0
azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0
azl3 fluent-bit 3.1.10-8 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update) KBRelease Notes (Security Update) — fixed build 1.34.8-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69186
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade