What is CVE-2026-18839?

CVE-2026-18839 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. Popt-devel: popt-static: size_t underflow in singleoptionhelp

Which CVE IDs does CVE-2026-18839 cover?

CVE-2026-18839 covers the following CVE IDs: CVE-2026-18839. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-18839?

CVE-2026-18839 has a CVSS v3 base score of 2.2, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-18839?

CVE-2026-18839 affects 3 products, including: azl3 popt 1.19-1 on Azure Linux 3.0; azl3 rsync 3.4.3-1 on Azure Linux 3.0; azl3 rsync 3.5.0-1 on Azure Linux 3.0.

CVE-2026-18839LowCVSS 2.2

Popt-devel: popt-static: size_t underflow in singleoptionhelp

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-18839 →

🎯 Affected products3

azl3 popt 1.19-1 on Azure Linux 3.0
azl3 rsync 3.4.3-1 on Azure Linux 3.0
azl3 rsync 3.5.0-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18839
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade