CVE-2026-59691
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.
- Score
- CVSS 3.1 7.1 High
- Status
- Awaiting Analysis - secalert@redhat.com
- Published
- 2026-07-09
- Last modified
- 2026-09-10
- Weaknesses
- CWE-787
Affected products
- Enterprise Linux (Redhat)
- Enterprise Linux Eus (Redhat)
- Rhel Aus (Redhat)
- Rhel E4s (Redhat)
- Rhel Els (Redhat)
- Rhel Eus (Redhat)
- Rhel Eus Long Life (Redhat)
- Rhel Tus (Redhat)
References
- https://access.redhat.com/errata/RHSA-2026:47179
- https://access.redhat.com/errata/RHSA-2026:47180
- https://access.redhat.com/errata/RHSA-2026:47731
- https://access.redhat.com/errata/RHSA-2026:54658
- https://access.redhat.com/errata/RHSA-2026:54659
- https://access.redhat.com/errata/RHSA-2026:54660
- https://access.redhat.com/errata/RHSA-2026:54664
- https://access.redhat.com/errata/RHSA-2026:54665
- https://access.redhat.com/errata/RHSA-2026:54752
- https://access.redhat.com/errata/RHSA-2026:56658
- https://access.redhat.com/errata/RHSA-2026:56772
- https://access.redhat.com/errata/RHSA-2026:62532
- 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
