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

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-15 · updated 2026-08-03
Weakness: CWE-122

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 products

Red Hat Enterprise Linux 10: all versions — fixed in 0:1.26.7-2.el10_2.4
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:1.24.11-3.el10_0.4
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:0.10.23-25.el7_9, 0:1.10.4-6.el7_9
Red Hat Enterprise Linux 8: all versions — fixed in 0:1.16.1-8.el8_10
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:1.16.1-4.el8_4.2
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:1.16.1-4.el8_4.2
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:1.16.1-4.el8_6.2
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:1.16.1-4.el8_6.2
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:1.16.1-4.el8_8.2
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:1.16.1-4.el8_8.2
Red Hat Enterprise Linux 9: all versions — fixed in 0:1.22.12-7.el9_8.1
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:1.18.4-9.el9_2.3
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:1.22.1-6.el9_4.4
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:1.22.12-5.el9_6.4

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.4; Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-3.el10_0.4; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.10.23-25.el7_9, 0:1.10.4-6.el7_9; Red Hat Enterprise Linux 8 0:1.16.1-8.el8_10; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.16.1-4.el8_4.2; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_4.2; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.16.1-4.el8_6.2; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_6.2; Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.16.1-4.el8_8.2; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.16.1-4.el8_8.2; Red Hat Enterprise Linux 9 0:1.22.12-7.el9_8.1; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.18.4-9.el9_2.3. Check the vendor advisory for mitigations.

References

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