What is CVE-2026-56389?

CVE-2026-56389 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Arbitrary Command Execution in GNU Bison

Which CVE IDs does CVE-2026-56389 cover?

CVE-2026-56389 covers the following CVE IDs: CVE-2026-56389. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-56389?

CVE-2026-56389 affects 2 products, including: azl3 bison 3.8.2-1 on Azure Linux 3.0; azl3 bison 3.8.2-2 on Azure Linux 3.0.

CVE-2026-56389Medium

Arbitrary Command Execution in GNU Bison

Vendor

Microsoft Security Response Center (MSRC)

Published

August 7, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-56389 →

🎯 Affected products2

azl3 bison 3.8.2-1 on Azure Linux 3.0
azl3 bison 3.8.2-2 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 3.8.2-2 Security Update — fixed build 3.8.2-2

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56389
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade