PT-2026-5254 · 1E Client+1 · 1E Client+1

Published 2026-01-29 · Updated 2026-02-11 · CVE-2026-23567

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) - Content Distribution Service versions prior to 26.1

Description An integer underflow exists in the UDP command handler of the Content Distribution Service (NomadBranch.exe). This flaw allows a nearby attacker to cause a denial-of-service by sending crafted UDP packets, leading to a heap-based buffer overflow and service crash.

Recommendations Update to version 26.1 or later.

Fix

DoS

Heap Based Buffer Overflow

Integer Overflow

Weakness Enumeration

CWE-122

CWE-190

Related Identifiers

BDU:2026-01102

CVE-2026-23567

Affected Products

1E Client

Teamviewer Dex Client

References · 8

• https://teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23567 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23567 · Security Note
• https://bdu.fstec.ru/vul/2026-01102 · Security Note
• https://twitter.com/CVEnew/status/2016805041412460868 · Twitter Post
• https://t.me/cveNotify/150246 · Telegram Post
• https://t.me/cveNotify/151756 · Telegram Post
• https://t.me/CVEtracker/43223 · Telegram Post