PT-2026-5252 · 1E+1 · 1E Client+1

Published 2026-01-29 · Updated 2026-01-29 · CVE-2026-23565

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions TeamViewer DEX Client (former 1E Client) versions prior to 26.1

Description A flaw exists in the TeamViewer DEX Client (formerly 1E Client) - Content Distribution Service (NomadBranch.exe) that, for systems running Windows, allows an attacker on the adjacent network to terminate the NomadBranch.exe process by sending specially crafted requests. This can lead to a denial-of-service condition affecting the Content Distribution Service.

Recommendations Update TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) to version 26.1 or later.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-01099

CVE-2026-23565

Affected Products

1E Client

Teamviewer Dex Client

References · 7

• https://osv.dev/vulnerability/CVE-2026-23565 · Vendor Advisory
• https://teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23565 · Security Note
• https://bdu.fstec.ru/vul/2026-01099 · Security Note
• https://twitter.com/CVEnew/status/2016805043178229782 · Twitter Post
• https://t.me/CVEtracker/43221 · Telegram Post
• https://t.me/cveNotify/150244 · Telegram Post