Vulnerability Description
LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/LibVNC/libvncserver/commit/5b270544b85233668b98161323297d418a
- https://github.com/LibVNC/libvncserver/security/advisories/GHSA-jcc5-8wj4-7c58
FAQ
What is CVE-2026-44988?
CVE-2026-44988 is a vulnerability with a CVSS score of 8.8 (HIGH). LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but ...
How severe is CVE-2026-44988?
CVE-2026-44988 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44988?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.