What is CVE-2026-58209?

CVE-2026-58209 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. NATS Server: MQTT retained and QoS replay bypass subscribe deny filters

Which CVE IDs does CVE-2026-58209 cover?

CVE-2026-58209 covers the following CVE IDs: CVE-2026-58209. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-58209?

CVE-2026-58209 has a CVSS v3 base score of 4.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-58209?

CVE-2026-58209 affects 1 product, including: azl3 telegraf 1.31.0-23 on Azure Linux 3.0.

CVE-2026-58209MediumCVSS 4.3

NATS Server: MQTT retained and QoS replay bypass subscribe deny filters

Vendor

Microsoft Security Response Center (MSRC)

Published

July 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-58209 →

🎯 Affected products1

azl3 telegraf 1.31.0-23 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.31.0-24

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58209
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade