What is CVE-2026-45599?

CVE-2026-45599 is a high-severity vulnerability in Microsoft Windows_10_1607, classified under Use After Free. CVSS score: 8.1/10. Published 2026-06-09.

How severe is CVE-2026-45599?

High severity. CVSS v3 base score is 8.1 out of 10.

Use After Free in Microsoft Windows_10_1607

CVE-2026-45599

Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

Vulnerability class: Use-After-Free

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_1607
Microsoft Windows_10_1809
Microsoft Windows_10_21h2
Microsoft Windows_10_22h2
Microsoft Windows_11_23h2
Microsoft Windows_11_24h2
Microsoft Windows_11_25h2
Microsoft Windows_11_26h1
Microsoft Windows_server_2012 — versions r2
Microsoft Windows_server_2016

Weakness classification (CWE)

CWE-416 — Use After Free

References

secure@microsoft.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-45599?: CVE-2026-45599 is a high-severity vulnerability in Microsoft Windows_10_1607, classified under Use After Free. CVSS score: 8.1/10. Published 2026-06-09.
How severe is CVE-2026-45599?: High severity. CVSS v3 base score is 8.1 out of 10.