Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:36749
- https://access.redhat.com/errata/RHSA-2026:36834
- https://access.redhat.com/errata/RHSA-2026:37130
- https://access.redhat.com/errata/RHSA-2026:47069
- https://access.redhat.com/errata/RHSA-2026:47070
- https://access.redhat.com/errata/RHSA-2026:47071
- https://access.redhat.com/errata/RHSA-2026:47075
- https://access.redhat.com/errata/RHSA-2026:47076
- https://access.redhat.com/errata/RHSA-2026:47176
- https://access.redhat.com/errata/RHSA-2026:47717
- https://access.redhat.com/errata/RHSA-2026:47718
- https://access.redhat.com/errata/RHSA-2026:49517
- https://access.redhat.com/security/cve/CVE-2026-52720
- https://bugzilla.redhat.com/show_bug.cgi?id=2486731
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5105
FAQ
What is CVE-2026-52720?
CVE-2026-52720 is a vulnerability with a CVSS score of 8.8 (HIGH). 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...
How severe is CVE-2026-52720?
CVE-2026-52720 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52720?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.