PT-2026-2690 · Microsoft · Windows Ntfs +1

Immortalp0Ny + 1 · Published 2026-01-13 · Updated 2026-01-14 · CVE-2026-20840

Positive Technologies · (AI Summary)

CVSS v3.1

7.8

7.8

High

Base vector

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

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

Description A heap-based buffer overflow exists in Windows NTFS that could allow a local attacker to execute code. The issue may allow remote attackers to execute arbitrary code and impact the system.

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

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-20840

Affected Products

Windows

Windows Ntfs

References · 5

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20840 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20840 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20840 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20840 · Security Note
• https://twitter.com/immortalp0ny/status/2011371505960264114 · Twitter Post