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gst-plugins-bad1.0

A heap buffer overflow vulnerability exists in the GStreamer rfbsrc plugin when connecting to a malicious RFB/VNC server that uses a 16bpp framebuffer with Hextile encoding. This causes an out-of-bounds write in heap memory, potentially leading to denial of service or memory corruption. Exploitation requires user interaction by connecting to a malicious server. The vulnerability affects the gstreamer1-plugins-bad-free package in Red Hat Enterprise Linux versions 8, 9, and 10. No complete mitigation is available, but risk can be reduced by avoiding untrusted VNC servers and removing the vulnerable plugin if unused.

CVE-2026-59691 is a heap buffer overflow vulnerability in the GStreamer rfbsrc plugin's handling of Hextile-encoded updates from RFB/VNC servers advertising a 16bpp framebuffer. The vulnerability arises because the plugin writes 32-bit pixel values into a buffer allocated for 16-bit pixels, causing an out-of-bounds heap write. This can lead to process crashes and potential memory corruption. Exploitation requires a user to connect a GStreamer pipeline to a malicious VNC server. While code execution has not been demonstrated, it cannot be ruled out. This vulnerability is rated as Important by Red Hat and affects gstreamer1-plugins-bad-free in Red Hat Enterprise Linux 8, 9, and 10, as well as Red Hat In-Vehicle Operating System. No official patch or complete mitigation is available, but risk reduction measures include avoiding untrusted VNC servers, removing the rfbsrc plugin if not needed, and restricting outbound VNC connections via firewall rules.

Detailed information about UBUNTU-CVE-2026-59691 affecting null gst-plugins-bad1.0. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-59691 - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/security/updates/classification/#important

2497344

Canonical URL

Red Hat Security Advisory: gstreamer-plugins-bad-free security update

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