CVE-2026-40377

Heap-based buffer overflow in Windows Cryptographic Services allows an authorized attacker to elevate privileges locally.

• microsoft windows 10 1607 (< 10.0.14393.9140) • microsoft windows 10 1809 (< 10.0.17763.8755) • microsoft windows 10 21h2 (< 10.0.19044.7291) • microsoft windows 10 22h2 (< 10.0.19045.7291) • microsoft windows 11 23h2 (< 10.0.22631.7079) • microsoft windows 11 24h2 (< 10.0.26100.8390) • microsoft windows 11 25h2 (< 10.0.26200.8390) • microsoft windows 11 26h1 (< 10.0.28000.2113) • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 (< 10.0.14393.9140) • microsoft windows server 2019 (< 10.0.17763.8755) • microsoft windows server 2022 (< 10.0.20348.5074) • microsoft windows server 2022 23h2 (< 10.0.25398.2330) • microsoft windows server 2025 (< 10.0.26100.32772)