MEDIUM 5.3 Microsoft
CVE-2026-69186
c-ares: Memory-amplification denial of service via unvalidated DNS header record counts
Microsoft Security Update 2026-Sep: c-ares: Memory-amplification denial of service via unvalidated DNS header record counts
Affected Products
- azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0
- azl3 c-ares 1.30.0-2 on Azure Linux 3.0
- azl3 fluent-bit 3.1.10-8 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69186
- https://nvd.nist.gov/vuln/detail/CVE-2026-69186
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-09-08 via Microsoft. Affected: azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0, azl3 c-ares 1.30.0-2 on Azure Linux 3.0, azl3 fluent-bit 3.1.10-8 on Azure Linux 3.0.
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