PT-2026-42161 · Microsoft · Defender

Published 2026-05-19 · Updated 2026-07-09 · CVE-2026-45498

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Defender Antimalware Platform (affected versions not specified)

Description An issue exists in the Microsoft Defender Antimalware Platform involving uncontrolled resource consumption. This can be exploited to cause a denial of service, a condition where the system becomes unavailable to its intended users.

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

DoS

RCE

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

BDU:2026-07109

CVE-2026-45498

Affected Products

Defender

References · 86

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-07109 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-45498 · Security Note
• https://twitter.com/lyrie_ai/status/2063474531549778131 · Twitter Post
• https://twitter.com/TheHackersNews/status/2057416212456628525 · Twitter Post
• https://twitter.com/NetSecIO/status/2057539610956161420 · Twitter Post
• https://twitter.com/AseemShrey/status/2074643658398396497 · Twitter Post
• https://t.me/true_secator/8391 · Telegram Post
• https://reddit.com/r/cybersecurity/comments/1tq4ryq/microsoft_vs_chaotic_eclipse_three_zerodays_now · Reddit Post
• https://twitter.com/SecureChap/status/2057432567075209730 · Twitter Post
• https://twitter.com/PurpleOps_io/status/2057410204833136651 · Twitter Post
• https://twitter.com/YourAnon_irc/status/2057720349966430615 · Twitter Post
• https://twitter.com/ai_dev_official/status/2057581443367276940 · Twitter Post
• https://twitter.com/stooee_/status/2059711330999824763 · Twitter Post