TeamViewer Flaw Lets Controlled Machines Attack the Users Connecting to Control Them
A high-severity vulnerability (CVE-2026-111585, CVSS 8.8) in TeamViewer allows a compromised host machine to attack the viewer initiating the remote session through a buffer overflow, potentially enab
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TeamViewer Flaw Lets Controlled Machines Attack the Users Connecting to Control Them
A high-severity TeamViewer vulnerability could let the machine being controlled turn the tables on the person connecting to it. According to The Hacker News, CVE-2026-111585 carries a CVSS score of 8.8 and affects TeamViewer in a way that may allow arbitrary code execution on Windows systems if a host machine is compromised or malicious. The finding was reported by researcher Omri Dar at security firm Remedio (The Hacker News, 2026-10-30).
What the flaw does
The issue is described as a buffer overflow caused by a memory calculation error. When the host provides screen size information, the viewer may allocate too little memory, allowing screen data to be written past the intended space. In the reported scenario, that can let the controlled machine attack the viewer computer initiating the remote session rather than the other way around (The Hacker News, 2026-10-30).
The reported impact is most serious on Windows, where the flaw may be leveraged to bypass operating system security defenses and execute arbitrary code on the viewer’s machine (The Hacker News, 2026-10-30).
Who is affected
The findings say the issue affects the Full Client on Windows, Linux, and macOS, plus the Windows Portable edition and the Android Remote Control app, in all versions prior to 15.83 (The Hacker News, 2026-10-30).
The attack reportedly works on TeamViewer’s default configuration and requires no password or extra user action beyond accepting the remote session, which makes the exposure more concerning for normal remote support use cases (The Hacker News, 2026-10-30).
What users can do
The source evidence says there is no workaround available. Users are advised to update to TeamViewer version 15.83 or later (The Hacker News, 2026-10-30).
Bottom line
This is a reminder that remote access tools can become attack paths themselves if one side of the connection is compromised. Based on the reported findings, the immediate defense is straightforward: update TeamViewer to a fixed version as soon as possible (The Hacker News, 2026-10-30).
Sources and dates
Research completed: 2026-11-02T05:10:00Z
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