What is CVE-2026-72854?

CVE-2026-72854 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation

Which CVE IDs does CVE-2026-72854 cover?

CVE-2026-72854 covers the following CVE IDs: CVE-2026-72854. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-72854?

CVE-2026-72854 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-72854?

CVE-2026-72854 affects 4 products, including: azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0; azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0; azl3 lttng-tools 2.13.11-1 on Azure Linux 3.0; azl3 msgpack 3.3.0-1 on Azure Linux 3.0.

CVE-2026-72854MediumCVSS 5.3

msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation

Vendor

Microsoft Security Response Center (MSRC)

Published

August 25, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-72854 →

🎯 Affected products4

azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0
azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0
azl3 lttng-tools 2.13.11-1 on Azure Linux 3.0
azl3 msgpack 3.3.0-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72854
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade