What is CVE-2026-102991?

CVE-2026-102991 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Mako: Path traversal via drive-letter URI on Windows in TemplateLookup

Which CVE IDs does CVE-2026-102991 cover?

CVE-2026-102991 covers the following CVE IDs: CVE-2026-102991. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-102991?

CVE-2026-102991 has a CVSS v3 base score of 6.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-102991?

CVE-2026-102991 affects 1 product, including: azl3 python-mako 1.2.4-3 on Azure Linux 3.0.

CVE-2026-102991MediumCVSS 6.5

Mako: Path traversal via drive-letter URI on Windows in TemplateLookup

Vendor

Microsoft Security Response Center (MSRC)

Published

October 3, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-102991 →

🎯 Affected products1

azl3 python-mako 1.2.4-3 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102991
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade