CVE-2026-23567 Integer underflow in Content Distribution Service UDP handler
An adjacent network attacker can cause a denial-of-service crash in the TeamViewer DEX Client via crafted UDP packets exploiting an integer underflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-23567?
CVE-2026-23567 is a medium-severity vulnerability in TeamViewer DEX, published on 29 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-23567?
It affects 1 product.
Products include Teamviewer Digital Employee Experience.
How do I fix CVE-2026-23567?
No fix has been published for CVE-2026-23567 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-23567 being exploited?
There is no known exploitation of CVE-2026-23567 in the wild and no public exploit code.
Other vulnerabilities in TeamViewer DEX
- CVE-2025-44016 File Hash Validation Bypass in NomadBranch.exe
- CVE-2025-64986 Command Injection in 1E-Explorer-TachyonCore-DevicesListeningOnAPort Instruction
- CVE-2025-64987 Command Injection in 1E-Explorer-TachyonCore-CheckSimpleIoC Instruction
- CVE-2025-64988 Command Injection in 1E-Nomad-GetCmContentLocations Instruction
- CVE-2025-64989 Command Injection in 1E-Explorer-TachyonCore-FindFileBySizeAndHash Instruction
Sources
Also known as GHSA-5c5v-ch87-qh4m.