CVE-2026-52720: Red Hat Enterprise Linux 10

High severity, CVSS 8.8. EPSS: 1.2% chance of exploitation in the next 30 days.

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

Published 2026-06-15. Last modified 2026-08-03.