What is CVE-2026-59928?

CVE-2026-59928 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions

Which CVE IDs does CVE-2026-59928 cover?

CVE-2026-59928 covers the following CVE IDs: CVE-2026-59928. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-59928?

CVE-2026-59928 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-59928?

CVE-2026-59928 affects 1 product, including: azl3 python-mistune 3.3.0-1 on Azure Linux 3.0.

CVE-2026-59928HighCVSS 7.5

Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions

Vendor

Microsoft Security Response Center (MSRC)

Published

July 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-59928 →

🎯 Affected products1

azl3 python-mistune 3.3.0-1 on Azure Linux 3.0

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59928