What is CVE-2026-9669?

CVE-2026-9669 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow

Which CVE IDs does CVE-2026-9669 cover?

CVE-2026-9669 covers the following CVE IDs: CVE-2026-9669. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-9669?

CVE-2026-9669 affects 3 products, including: azl3 python3 3.12.9-11 on Azure Linux 3.0; azl3 python3 3.12.9-13 on Azure Linux 3.0; azl3 python3 3.12.9-14 on Azure Linux 3.0.

CVE-2026-9669Medium

bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow

Vendor

Microsoft Security Response Center (MSRC)

Published

June 26, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-9669 →

🎯 Affected products3

azl3 python3 3.12.9-11 on Azure Linux 3.0
azl3 python3 3.12.9-13 on Azure Linux 3.0
azl3 python3 3.12.9-14 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 3.12.9-14

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-9669
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade