What is CVE-2026-12003?

CVE-2026-12003 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. CPython \u003e3.11 Insecure Input Validation resulting in privilege escalation

Which CVE IDs does CVE-2026-12003 cover?

CVE-2026-12003 covers the following CVE IDs: CVE-2026-12003. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-12003?

CVE-2026-12003 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-2026-12003Medium

CPython >3.11 Insecure Input Validation resulting in privilege escalation

Vendor

Microsoft Security Response Center (MSRC)

Published

June 26, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-12003 →

🎯 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-2026-12003
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade