CVE-2026-41476
Published: 24 April 2026
Summary
CVE-2026-41476 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Deskflow Deskflow. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation of Remote Services (T1210); ranked at the 26.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-41476 is a remote memory-safety vulnerability affecting Deskflow, a keyboard and mouse sharing application, in versions prior to 1.26.0.138. The issue lies in the clipboard deserialization implementation within src/lib/deskflow/IClipboard.cpp. Specifically, ClipboardChunk::assemble() in src/lib/deskflow/ClipboardChunk.cpp validates only the outer clipboard transfer size and fails to check the internal structure of the serialized clipboard blob, allowing malformed inner lengths to propagate unchanged to IClipboard::unmarshall(). This enables a connected peer to trigger an out-of-bounds read (CWE-120) by sending a malformed clipboard update. The vulnerability carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
A connected peer with low privileges (PR:L) can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L) and without requiring user interaction (UI:N). Exploitation involves sending a specially crafted clipboard update, which bypasses validation and leads to an out-of-bounds read in the deserialization process. The unchanged scope (S:U) combined with high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) suggests potential for severe consequences, such as data disclosure, corruption, or denial of service.
The Deskflow GitHub security advisory (GHSA-3jp5-g964-cgmh) confirms the vulnerability is fixed in version 1.26.0.138. Mitigation requires updating to Deskflow 1.26.0.138 or later to address the validation deficiencies in clipboard handling.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25622
Vulnerability details
Deskflow is a keyboard and mouse sharing app. Prior to 1.26.0.138, a remote memory-safety vulnerability in Deskflow's clipboard deserialization allows a connected peer to trigger an out-of-bounds read by sending a malformed clipboard update. The issue is in the implementation…
more
of src/lib/deskflow/IClipboard.cpp. This is reachable because ClipboardChunk::assemble() in src/lib/deskflow/ClipboardChunk.cpp validates only the outer clipboard transfer size. It does not validate the internal structure of the serialized clipboard blob, so malformed inner lengths reach IClipboard::unmarshall() unchanged. This vulnerability is fixed in 1.26.0.138.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The remote OOB read in Deskflow's clipboard deserialization (via malformed update from a connected peer) directly enables exploitation of the remote service for initial access or impact.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the lack of validation on the internal structure of serialized clipboard blobs, preventing malformed inputs from triggering out-of-bounds reads during deserialization.
Implements memory safeguards like address space randomization and non-executable stacks to mitigate exploitation of memory-safety vulnerabilities such as out-of-bounds reads.
Requires timely identification, reporting, and patching of flaws like the clipboard deserialization vulnerability fixed in Deskflow 1.26.0.138.