CVE-2026-23565

Service crash via crafted adjacent-network requests

Published Jan 29, 2026 · Updated Jan 29, 2026

NULL pointer dereference in TeamViewer DEX Client before 26.1 allows remote attackers to crash NomadBranch.exe via crafted requests. NomadBranch.exe dereferences a null pointer while processing a crafted request, which terminates the process. The service must be enabled and reachable from the adjacent network; it is disabled by default, and the result is interruption of content distribution.

CVSS severity6.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in TeamViewer DEX Client before 26.1 allows remote attackers to crash NomadBranch.exe via crafted requests. NomadBranch.exe dereferences a null pointer while processing a crafted request, which terminates the process. The service must be enabled and reachable from the adjacent network; it is disabled by default, and the result is interruption of content distribution.

The record

CVE
CVE-2026-23565
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
TeamViewer
Product
TeamViewer DEX Client
Classifications
CWE-476, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TeamViewer · TeamViewer DEX Clientversion=0 <26.1

Published CVSS scores

6.5TeamViewer Germany GmbHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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