Use After Free in Microsoft Windows_10_1809
CVE-2026-40415
Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
Vulnerability class: Use-After-Free
EPSS: 0.001 (25.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_10_1809
- Microsoft Windows_10_21h2
- Microsoft Windows_10_22h2
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows_11_23h2
- Microsoft Windows_11_24h2
- Microsoft Windows_11_25h2
- Microsoft Windows_11_26h1
Weakness classification (CWE)
References
- Windows TCP/IP Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-40415?
- CVE-2026-40415 is a high-severity vulnerability in Microsoft Windows_10_1809, classified under Use After Free. CVSS score: 8.1/10. Published 2026-05-12.
- How severe is CVE-2026-40415?
- High severity. CVSS v3 base score is 8.1 out of 10.