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Vulnerability · Published Jun 15, 2026 · Assigned by redhat

CVE-2026-52720Gstreamer1-plugins-bad-free: gstreamer: heap buffer overflow via crafted vnc server rectangle in librfb

High 8.8

In plain English

A high-severity heap buffer overflow in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.6%top 49.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10gstreamer1-plugins-bad-free1.26.7-2.el10_2.4ALSA-2026:36749
AlmaLinux:8gstreamer1-plugins-bad-free1.16.1-8.el8_10ALSA-2026:37130
AlmaLinux:9gstreamer1-plugins-bad-free1.22.12-7.el9_8.1ALSA-2026:36834
AlmaLinux:10gstreamer1-plugins-bad-free-devel1.26.7-2.el10_2.4ALSA-2026:36749
AlmaLinux:8gstreamer1-plugins-bad-free-devel1.16.1-8.el8_10ALSA-2026:37130
AlmaLinux:9gstreamer1-plugins-bad-free-devel1.22.12-7.el9_8.1ALSA-2026:36834
AlmaLinux:10gstreamer1-plugins-bad-free-libs1.26.7-2.el10_2.4ALSA-2026:36749
AlmaLinux:9gstreamer1-plugins-bad-free-libs1.22.12-7.el9_8.1ALSA-2026:36834
Debian:12gst-plugins-bad1.01.22.0-4+deb12u8DEBIAN-CVE-2026-52720
Debian:13gst-plugins-bad1.01.26.2-3+deb13u3DEBIAN-CVE-2026-52720
Debian:14gst-plugins-bad1.01.28.5-1DEBIAN-CVE-2026-52720
Rocky Linux:10gstreamer1-plugins-bad-free0:1.26.7-2.el10_2.4RLSA-2026:36749
Rocky Linux:8gstreamer1-plugins-bad-free0:1.16.1-8.el8_10RLSA-2026:37130
Rocky Linux:9gstreamer1-plugins-bad-free0:1.22.12-7.el9_8.1RLSA-2026:36834
Ubuntu:25.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-52720
Ubuntu:26.04:LTSgst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-52720
Ubuntu:26.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-52720

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References