Buffer overflow in Microsoft Windows 11 Version 23h2

CVE-2026-72940

Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-72940?
CVE-2026-72940 is a high-severity vulnerability in Microsoft Windows 11 Version 23h2, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-08.
How severe is CVE-2026-72940?
High severity. CVSS v3 base score is 8.8 out of 10.