CVE-2026-59691

Gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb hextile heap out-of-bounds write with 16bpp framebuffer

State: Published
Severity: 7.1 High
Published: Jul 9, 2026
Updated: Sep 10, 2026
Reserved: Jul 6, 2026

Description

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H	redhat

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:1.26.7-2.el10_2.6 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:1.24.11-3.el10_0.6 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.10.4-7.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:0.10.23-26.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.16.1-9.el8_10.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.16.1-4.el8_4.4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.16.1-4.el8_4.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.16.1-4.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.16.1-4.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.16.1-4.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.16.1-4.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.22.12-7.el9_8.3 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.18.4-9.el9_2.5 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:1.22.1-6.el9_4.6 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.22.12-5.el9_6.6 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:47179vendor-advisory
RHSA-2026:47180vendor-advisory
RHSA-2026:47731vendor-advisory
RHSA-2026:54658vendor-advisory
RHSA-2026:54659vendor-advisory
RHSA-2026:54660vendor-advisory
RHSA-2026:54664vendor-advisory
RHSA-2026:54665vendor-advisory
RHSA-2026:54752vendor-advisory
RHSA-2026:56658vendor-advisory
RHSA-2026:56772vendor-advisory
RHSA-2026:62532vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-59691vdb-entry
RHBZ#2497343issue-tracking
https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173

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