Out-of-bounds read in gst-plugins-ugly and gstreamer - CVE-2026-53703

Vulnerability identifier: #VU141095

CSH Severity: Low

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53703

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in the rmdemux and rademux demuxers when parsing malformed RealMedia files. A remote attacker can provide a crafted RealMedia file to disclose sensitive information.

The issue occurs while parsing file headers, stream properties, and audio packets.

gst-plugins-ugly
gstreamer
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
gstreamer1-plugins-ugly-free (Red Hat package)

Install security update from vendor's website.

gst-plugins-ugly - update to 1.28.4
gstreamer - update to 1.28.4
gstreamer1-plugins-ugly-free (Red Hat package) - addressed in versions 1.22.12-4.el9_6.1, 1.22.12-6.el9_8.1, 1.24.11-1.el10_0.2, 1.26.7-2.el10_2.1

• https://gstreamer.freedesktop.org/security/sa-2026-0042.html

• Multiple vulnerabilities in GStreamer
• Red Hat Enterprise Linux 10 update for gstreamer1-plugins-ugly-free
• Red Hat Enterprise Linux 9 update for gstreamer1-plugins-ugly-free
• Red Hat Enterprise Linux 10 update for gstreamer1-plugins-ugly-free
• Red Hat Enterprise Linux 9 update for gstreamer1-plugins-ugly-free