Integer Underflow in TeamViewer NomadBranch UDP Causes DoS

Publication date: 2026-01-29

Last updated on: 2026-02-11

Assigner: TeamViewer Germany GmbH

Description

An integer underflow in the UDP command handler of the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to trigger a heap-based buffer overflow and cause a denial-of-service (service crash) via specially crafted UDP packets.

CVSS Scores

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Meta Information

Published

2026-01-29

Last Modified

2026-02-11

Generated

2026-07-06

AI Q&A

2026-01-29

EPSS Evaluated

2026-07-05

NVD

CVE-2026-23567

EUVD

EUVD-2026-4985

Affected Vendors & Products

Vendor	Product	Version / Range
teamviewer	digital_employee_experience	to 26.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This vulnerability is an integer underflow in the UDP command handler of the TeamViewer DEX Client's Content Distribution Service (NomadBranch.exe) prior to version 26.1 on Windows. It allows an adjacent network attacker to send specially crafted UDP packets that trigger a heap-based buffer overflow, which can cause the service to crash (denial-of-service).

Impact Analysis

The vulnerability can cause a denial-of-service condition by crashing the affected service, potentially disrupting normal operations of the TeamViewer DEX Client on Windows systems.

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