SecuriTricks - CVE-2026-45657

Description

Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

Product(s) Impacted

Vendor	Product	Versions
Microsoft	Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2022 Windows Server 2025	* * * * * *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-122

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
o	microsoft	windows_11_23h2	/	/	/	/	/	/	arm64	/
o	microsoft	windows_11_23h2	/	/	/	/	/	/	x64	/
o	microsoft	windows_11_24h2	/	/	/	/	/	/	arm64	/
o	microsoft	windows_11_24h2	/	/	/	/	/	/	x64	/
o	microsoft	windows_11_25h2	/	/	/	/	/	/	arm64	/
o	microsoft	windows_11_25h2	/	/	/	/	/	/	x64	/
o	microsoft	windows_11_26h1	/	/	/	/	/	/	arm64	/
o	microsoft	windows_11_26h1	/	/	/	/	/	/	x64	/
o	microsoft	windows_server_2022	/	/	/	/	/	/	/	/
o	microsoft	windows_server_2025	/	/	/	/	/	/	x64	/

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657

CVSS Score

9.8 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View Vector String

Timeline

Published: June 9, 2026, 5:17 p.m.
Last Modified: June 10, 2026, 8:44 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-45657