What is CVE-2026-40170?

CVE-2026-40170 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. ngtcp2 has a qlog transport parameter serialization stack buffer overflow

Which CVE IDs does CVE-2026-40170 cover?

CVE-2026-40170 covers the following CVE IDs: CVE-2026-40170. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40170?

CVE-2026-40170 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-40170HighCVSS 7.5

ngtcp2 has a qlog transport parameter serialization stack buffer overflow

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40170 →