PT-2026-2691 · Microsoft · Windows

Varun Goel · Published 2026-01-13 · Updated 2026-01-15 · CVE-2026-20842

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/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 flaw exists in the Desktop Window Manager (DWM) component of Windows that could allow a local attacker to gain elevated privileges. The issue involves a use-after-free condition.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-00430

CVE-2026-20842

Affected Products

Windows

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20842 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-20842 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00430 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20842 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20842 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20842 · Vendor Advisory
• https://twitter.com/CVEnew/status/2011759674568085655 · Twitter Post