CVE-2026-41476 is a high-severity vulnerability found in Deskflow, a keyboard and mouse sharing application. The vulnerability arises from a remote memory-safety issue related to clipboard deserialization, which could be exploited by a connected peer to trigger an out-of-bounds read. This is achieved by sending a malformed clipboard update, allowing attackers to manipulate memory inappropriately. The issue specifically exists in the implementation of src/lib/deskflow/IClipboard.cpp and is reachable due to inadequate validation of the internal structure of the serialized clipboard blob.
The vulnerability has been assigned a CVSS score of 7.4, indicating a high severity level. The attack vector is classified as network-based, with low complexity, meaning an attacker does not need extensive technical skills to exploit it. Additionally, it requires low privileges and does not necessitate user interaction, making it particularly concerning for organizations utilizing Deskflow.
Risk to organizations includes potential unauthorized access and manipulation of confidential data, as the vulnerability impacts confidentiality, integrity, and availability. The urgency for defenders to address this vulnerability is high, especially considering its remote exploitability and the simplicity of the attack.
Organizations should prioritize patching immediately, as Deskflow has released a fix in version 1.26.0.138. Failure to apply this update may leave systems vulnerable to exploitation and associated risks.
Vulnerability Details
This vulnerability allows a remote attacker to exploit the clipboard deserialization feature within Deskflow. The vulnerability type is classified as a memory safety issue, specifically a buffer overflow (CWE-120). The CVSS score of 7.4 suggests that it poses a significant risk, and it can be exploited with minimal effort given its network-based attack vector.
The vulnerability was published on April 24, 2026, and the issue has been documented as fixed in the latest version of Deskflow. Understanding the implications of this vulnerability is critical for organizations using the application.
Technical Analysis
The root cause of this vulnerability stems from the design and implementation of the clipboard handling functionality within Deskflow. The ClipboardChunk::assemble() method validates only the outer clipboard transfer size, leaving internal structure validation unaddressed. As a result, malformed inner lengths can pass through to the IClipboard::unmarshall() method, triggering an out-of-bounds read.
The attack vector is network-based, which means an attacker can initiate an exploit over the network without physical access to the victim's machine. The complexity of the attack is low, requiring only basic skills to send a malformed clipboard update. Privileges required for exploitation are also low, allowing attackers to leverage this vulnerability effectively.
There is no user interaction required, enhancing the risk profile of this vulnerability. The impact on confidentiality, integrity, and availability is rated as high, suggesting that successful exploitation could lead to significant negative consequences for affected organizations.
Risk & Impact Analysis
Organizations utilizing Deskflow should be acutely aware of the risks associated with CVE-2026-41476. The potential for unauthorized data access and manipulation presents a considerable threat. The blast radius of this vulnerability can extend to any connected user of the application, making it a widespread concern.
Given the CVSS score of 7.4, the urgency for remediation is high. Organizations should assess their exposure and prioritize the application of the patch provided in version 1.26.0.138 of Deskflow to mitigate risks. Additionally, monitoring for any anomalous activity related to clipboard operations is advisable to detect potential exploitation attempts.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Deskflow are all prior to 1.26.0.138. Organizations should ensure they upgrade to this version or later to mitigate the risks associated with CVE-2026-41476.
Mitigation & Remediation
To mitigate the risks posed by this vulnerability, organizations should apply the following measures:
1. **Patch/Update**: Upgrade to Deskflow version 1.26.0.138 or later.
2. **Monitoring**: Implement monitoring for clipboard activities to identify any suspicious behavior.
3. **Configuration Hardening**: Review and harden configurations related to clipboard sharing.
For further guidance on security measures, organizations should consider engaging in penetration testing services to identify vulnerabilities in their systems.
Detection Guidance
To detect potential exploitation attempts related to this vulnerability, organizations should monitor for the following indicators:
1. **Log Indicators**: Review logs for any anomalous clipboard activity.
2. **Behavioral Anomalies**: Be alert for unusual application behavior or crashes.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-41476 lies in its demonstration of how insufficient input validation can lead to critical vulnerabilities. Security teams should focus on enhancing their development processes to prevent such vulnerabilities in future iterations of software.
Security practitioners must remain vigilant about clipboard-related functionality, as it is often overlooked in security assessments. The pattern of vulnerabilities in memory safety emphasizes the necessity for rigorous testing and validation during the software development lifecycle.
For further insights, organizations can refer to our resources on penetration testing methodology and vulnerability management programs to strengthen their security posture.
Additionally, leveraging our security testing best practices can provide valuable insights into ongoing defense strategies against evolving threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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