What is CVE-2026-3087?

CVE-2026-3087 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

Which CVE IDs does CVE-2026-3087 cover?

CVE-2026-3087 covers the following CVE IDs: CVE-2026-3087. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-3087?

CVE-2026-3087 affects 6 products, including: azl3 python3 3.12.9-10 on Azure Linux 3.0; 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; cbl2 python3 3.9.19-19 on CBL Mariner 2.0; and others — see the full list on the advisory page.

CVE-2026-3087Medium

shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-3087 →

🎯 Affected products6

azl3 python3 3.12.9-10 on Azure Linux 3.0
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
cbl2 python3 3.9.19-19 on CBL Mariner 2.0
cbl2 python3 3.9.19-19 on CBL-Mariner 2.0

✅ Remediation

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

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3087
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade