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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.

PUBLISHED Reserved 2026-07-06 | Published 2026-07-09 | Updated 2026-07-09 | Assigner redhat




HIGH: 7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Problem types

Out-of-bounds Write

Product status

Default status
affected

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affected

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affected

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affected

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affected

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affected

Timeline

2026-07-06:Reported to Red Hat.
2026-07-08:Made public.

Credits

Red Hat would like to thank Clouditera Security (Clouditera), NSFOCUS (NSFOCUS), and Z.ai Security (Z.ai) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-59691 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2497343 (RHBZ#2497343) issue-tracking

gitlab.freedesktop.org/...amer-security/-/merge_requests/100

gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173

cve.org (CVE-2026-59691)

nvd.nist.gov (CVE-2026-59691)

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