What is CVE-2026-102266?

CVE-2026-102266 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation

Which CVE IDs does CVE-2026-102266 cover?

CVE-2026-102266 covers the following CVE IDs: CVE-2026-102266. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-102266?

CVE-2026-102266 has a CVSS v3 base score of 7.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-102266?

CVE-2026-102266 affects 1 product, including: azl3 python-jwt 2.13.0-1 on Azure Linux 3.0.

CVE-2026-102266HighCVSS 7.4

PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation

Vendor

Microsoft Security Response Center (MSRC)

Published

October 1, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-102266 →

🎯 Affected products1

azl3 python-jwt 2.13.0-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102266
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade