In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, because of incorrect permissions.
https://www.openwall.com/lists/oss-security/2026/03/26/7
https://sourceforge.net/projects/tigervnc/files/stable/1.16.2
https://groups.google.com/g/tigervnc-announce/c/anHL9WLshLI
https://github.com/TigerVNC/tigervnc/commit/0b5cab169d847789efa54459a87659d3fd484393