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

Immortalp0Ny + 1 · Published 2025-10-03 · Updated 2026-02-17 · CVE-2026-20840

Positive Technologies (AI Summary)

CVSS v3.1

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 an authorized attacker to execute code locally. Remote attackers may be able 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.

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2025-12465

CVE-2026-20840

Affected Products

Windows

Windows Ntfs

References · 11

• https://bdu.fstec.ru/vul/2025-12465 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20840 · Security Note
• 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://osv.dev/vulnerability/CVE-2026-20840 · Vendor Advisory
• https://twitter.com/cvedatabase/status/2019343238214127621 · Twitter Post
• https://twitter.com/immortalp0ny/status/2011371505960264114 · Twitter Post
• https://cybersecurity-help.cz/vulnerabilities/121344 · Note
• https://twitter.com/CVEnew/status/2011759675365101776 · Twitter Post
• https://dbugs.ptsecurity.com/vulnerability/PT-2026-2690 · Note