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Description

A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash.

PUBLISHED Reserved 2026-06-08 | Published 2026-06-15 | Updated 2026-06-15 | Assigner redhat




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

Heap-based Buffer Overflow

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-05-19:Reported to Red Hat.
2026-06-15:Made public.

Credits

Red Hat would like to thank JUNYI LIU for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-52720 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2486731 (RHBZ#2486731) issue-tracking

gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5105

cve.org (CVE-2026-52720)

nvd.nist.gov (CVE-2026-52720)

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