PT-2026-40225 · Microsoft · Windows

Published 2026-05-12 · Updated 2026-05-19 · CVE-2026-40415

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

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

Description A use after free issue in the Windows TCP/IP stack allows an unauthorized attacker to execute code over a network. Use after free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed.

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

DoS

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-07120

CVE-2026-40415

Affected Products

Windows

References · 10

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40415 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-07120 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-40415 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/732391 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40415 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40415 · Security Note
• https://twitter.com/windowsforum/status/2054289908282319314 · Twitter Post
• https://twitter.com/vuldb/status/2054259117360038036 · Twitter Post
• https://twitter.com/leonov_av/status/2056821141210083493 · Twitter Post
• https://twitter.com/vuldb/status/2054349714603290850 · Twitter Post