PT-2026-32736 · Microsoft · Hyper-V+1

B2Ahex + 1 · CVE-2026-26156 · Published 2026-04-14 · Updated 2026-04-15

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows Hyper-V (affected versions not specified)

Description A heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally. This issue can also allow remote attackers to execute arbitrary code and affect the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Out of bounds Read

Heap Based Buffer Overflow

Weakness Enumeration

CWE-20

CWE-135

CWE-125

CWE-122

Related Identifiers

BDU:2026-05301

CVE-2026-26156

Affected Products

Hyper-V

Windows

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26156 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-26156 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-05301 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26156 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-26156 · Security Note
• https://twitter.com/vuldb/status/2044122549328703696 · Twitter Post
• https://twitter.com/CVEnew/status/2044358622973427993 · Twitter Post