CVE-2026-52720

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

State: Published
Severity: 8.8 High
Published: Jun 15, 2026
Updated: Aug 3, 2026
Reserved: Jun 8, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat-SADP

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:1.26.7-2.el10_2.4 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:1.24.11-3.el10_0.4 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.10.4-6.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:0.10.23-25.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.16.1-8.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.16.1-4.el8_4.2 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.16.1-4.el8_4.2 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.16.1-4.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.16.1-4.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.16.1-4.el8_8.2 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.16.1-4.el8_8.2 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.22.12-7.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.18.4-9.el9_2.3 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:1.22.1-6.el9_4.4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.22.12-5.el9_6.4 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:36749vendor-advisory
RHSA-2026:36834vendor-advisory
RHSA-2026:37130vendor-advisory
RHSA-2026:47069vendor-advisory
RHSA-2026:47070vendor-advisory
RHSA-2026:47071vendor-advisory
RHSA-2026:47075vendor-advisory
RHSA-2026:47076vendor-advisory
RHSA-2026:47176vendor-advisory
RHSA-2026:47717vendor-advisory
RHSA-2026:47718vendor-advisory
RHSA-2026:49517vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-52720vdb-entry
RHBZ#2486731issue-tracking
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5105
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52720.json

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.