CVE-2026-59691
A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Source
- secalert@redhat.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.