CVE-2026-52720 Gstreamer1-plugins-bad-free: gstreamer: heap buffer overflow via crafted vnc server rectangle in librfb
A heap buffer overflow in GStreamer's librfb allows remote code execution or crashes via a malicious VNC server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-52720?
CVE-2026-52720 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 15 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-52720?
How do I fix CVE-2026-52720?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-52720 being exploited?
There is no known exploitation of CVE-2026-52720 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-52720, ECHO-08db-101f-0369, GHSA-38vh-57p3-w3gw, UBUNTU-CVE-2026-52720.