CVE-2026-23569

Stack-memory disclosure and service crash via crafted request

Published Jan 29, 2026 · Updated Jan 29, 2026

Out-of-bounds read in TeamViewer DEX Client before 26.1 on Windows allows remote attackers to leak stack memory and crash NomadBranch.exe. NomadBranch.exe request handling reads beyond an intended buffer boundary when processing a crafted request, exposing adjacent stack contents. The disabled-by-default Content Distribution Service must be enabled and reachable; leaked addresses can weaken ASLR and aid exploitation of other flaws.

CVSS severity6.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in TeamViewer DEX Client before 26.1 on Windows allows remote attackers to leak stack memory and crash NomadBranch.exe. NomadBranch.exe request handling reads beyond an intended buffer boundary when processing a crafted request, exposing adjacent stack contents. The disabled-by-default Content Distribution Service must be enabled and reachable; leaked addresses can weaken ASLR and aid exploitation of other flaws.

The record

CVE
CVE-2026-23569
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
TeamViewer
Product
TeamViewer DEX Client
Classifications
CWE-125, CAPEC-100, T1210
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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read
CAPEC-100Overflow Buffers
T1210Exploitation of Remote Services

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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