CVE-2026-42915

CVE-2026-42915

Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny service over an adjacent network.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-42915?: CVE-2026-42915 is a medium-severity vulnerability, classified under Incorrect Calculation of Buffer Size. CVSS score: 5.7/10. Published 2026-06-09.
How severe is CVE-2026-42915?: Medium severity. CVSS v3 base score is 5.7 out of 10.