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このページは Ubuntu 向けの修正状況です。脆弱性そのものの説明は CVE 本体のページにあります。 CVE-2026-50538 の詳細 →
カテゴリ
UBUNTU-CVE-2026-50538

LibVNCClient is a library for easy implementation of a VNC client. In versions 0.9.12 through 0.9.15, a malicious (or man-in-the-middle) VNC server ca...

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

LibVNCClient is a library for easy implementation of a VNC client. In versions 0.9.12 through 0.9.15, a malicious (or man-in-the-middle) VNC server can force a connecting libvncclient to write attacker-controlled data past the end of its framebuffer. This is an out-of-bounds heap write with attacker-controlled length, contents, and offset. It needs no authentication (the attacker is the server), works in a default build with default settings, and fires from a single FramebufferUpdate the moment the victim connects. It crashes any client unconditionally (denial of service); we also demonstrated it overwriting an application callback pointer and redirecting execution to attacker-chosen code (code execution) under the default configuration. Commit 540332be3e0acc566fa64da6f1b4680c72c724dd patches the issue.

出典: OSV.dev (Open Source Vulnerabilities) OSV

影響パッケージ

Ubuntu:Pro:14.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:14.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS italc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS italc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13+dfsg-3ubuntu0.2"}]}]
Ubuntu:22.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.14+dfsg-1ubuntu0.2"}]}]
Ubuntu:24.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.15+dfsg-1ubuntu0.2"}]}]
Ubuntu:25.10 tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 vino
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.10 tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.10 veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.10 x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS libvncserver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.15+dfsg-3ubuntu0.2"}]}]
Ubuntu:26.04:LTS tightvnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS veyon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS x11vnc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

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