PT-2026-42162 · Microsoft · Defender

Shaowei Yan · Published 2026-05-20 · Updated 2026-05-22 · CVE-2026-45584

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 Microsoft Defender (affected versions not specified)

Description A heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network. A heap-based buffer overflow occurs when an application writes more data to a heap-allocated memory block than it can hold, potentially corrupting adjacent memory.

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

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-45584

Affected Products

Defender

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-45584 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584 · Vendor Advisory
• https://twitter.com/vuldb/status/2057102353707508069 · Twitter Post
• https://twitter.com/fabian_bader/status/2057198207243804881 · Twitter Post
• https://reddit.com/r/CVEWatch/comments/1tkefta/top_10_trending_cves_22052026 · Reddit Post