What is CVE-2026-109821?

CVE-2026-109821 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Unbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir

Which CVE IDs does CVE-2026-109821 cover?

CVE-2026-109821 covers the following CVE IDs: CVE-2026-109821. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-109821?

CVE-2026-109821 affects 1 product, including: azl3 elixir 1.16.1-3 on Azure Linux 3.0.

CVE-2026-109821Medium

Unbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir

Vendor

Microsoft Security Response Center (MSRC)

Published

October 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-109821 →

🎯 Affected products1

azl3 elixir 1.16.1-3 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109821
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade