Vulnerability · Published Jun 15, 2026 · Assigned by redhat
CVE-2026-53703Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer audio stream header parser
High 7.1
In plain English
A high-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A vulnerability was found in the GStreamer RealMedia demuxer (gst-plugins-ugly). When processing a RealMedia (.rm) file, the demuxer parses MDPR (media properties) chunks to configure audio streams. For audio stream header versions 4 and 5, the parser reads fields such as codec type, packet size, sample rate, channel count, and extra codec data length from fixed offsets within the chunk without first checking that the chunk contains enough data. If a malicious file provides an MDPR chunk that is too small to contain a complete audio stream header, the parser reads beyond the end of the buffer. This can cause the application to crash. In some cases, bytes read past the buffer boundary may be incorporated into stream metadata, which could result in limited information disclosure.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | gstreamer1-plugins-ugly-free | 1.26.7-2.el10_2.1 | ALSA-2026:36673 |
| AlmaLinux:9 | gstreamer1-plugins-ugly-free | 1.22.12-6.el9_8.1 | ALSA-2026:36674 |
| Debian:12 | gst-plugins-ugly1.0 | no fix listed | DEBIAN-CVE-2026-53703 |
| Debian:13 | gst-plugins-ugly1.0 | no fix listed | DEBIAN-CVE-2026-53703 |
| Debian:14 | gst-plugins-ugly1.0 | 1.28.4-1 | DEBIAN-CVE-2026-53703 |
| Rocky Linux:10 | gstreamer1-plugins-ugly-free | 0:1.26.7-2.el10_2.1 | RLSA-2026:36673 |
| Rocky Linux:9 | gstreamer1-plugins-ugly-free | 0:1.22.12-6.el9_8.1 | RLSA-2026:36674 |
| Ubuntu:25.10 | gst-plugins-ugly1.0 | no fix listed | UBUNTU-CVE-2026-53703 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
References
- RHSA-2026:36673 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:36674 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:50688 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:50691 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-53703 vdb-entry, x_refsource_REDHAT
- RHBZ#2487613 issue-tracking, x_refsource_REDHAT