CVE-2026-59691

Description

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.

CVSS Vector

References

• https://access.redhat.com/security/cve/CVE-2026-59691
• https://bugzilla.redhat.com/show_bug.cgi?id=2497343
• https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100
• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173