Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
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/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
FAQ
What is CVE-2026-59691?
CVE-2026-59691 is a vulnerability with a CVSS score of 7.1 (HIGH). 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,...
How severe is CVE-2026-59691?
CVE-2026-59691 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59691?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.