CVE-2026-50538

CVE-2026-50538 · libvncclient Tight decoder has an attacker-controlled heap out-of-bounds write

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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.

CVSS 8.8 · Alta · EPSS 0,4% · Corrección disponible

Publicación

2026-08-21T21:03:58.147Z

Actualización

2026-08-24T19:39:57.811Z

Pila tecnológica: system

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