{"id":"OESA-2026-2490","summary":"libvncserver security update","details":"libvncserver is a set of programs using the RFB (Remote Frame Buffer) protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets (which LibVNCServer does), you can also connect using an in-browser VNC viewer like noVNC. It is already in wide use for administration, but it is not that easy to program a server yourself.\r\n\r\nSecurity Fix(es):\n\nLibVNCClient 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.(CVE-2026-44988)","modified":"2026-05-29T13:45:11.599104764Z","published":"2026-05-29T13:34:11Z","upstream":["CVE-2026-44988"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2490"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44988"}],"affected":[{"package":{"name":"libvncserver","ecosystem":"openEuler:24.03-LTS-SP1","purl":"pkg:rpm/openEuler/libvncserver&distro=openEuler-24.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-5.oe2403sp1"}]}],"ecosystem_specific":{"x86_64":["libvncserver-0.9.13-5.oe2403sp1.x86_64.rpm","libvncserver-debuginfo-0.9.13-5.oe2403sp1.x86_64.rpm","libvncserver-debugsource-0.9.13-5.oe2403sp1.x86_64.rpm","libvncserver-devel-0.9.13-5.oe2403sp1.x86_64.rpm"],"aarch64":["libvncserver-0.9.13-5.oe2403sp1.aarch64.rpm","libvncserver-debuginfo-0.9.13-5.oe2403sp1.aarch64.rpm","libvncserver-debugsource-0.9.13-5.oe2403sp1.aarch64.rpm","libvncserver-devel-0.9.13-5.oe2403sp1.aarch64.rpm"],"src":["libvncserver-0.9.13-5.oe2403sp1.src.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-2490.json"}}],"schema_version":"1.7.5"}