Vulnerability · Published Jun 15, 2026 · Assigned by redhat
CVE-2026-53704Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer fileinfo metadata 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 flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.
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-2026-53704 |
| Debian:13 | gst-plugins-ugly1.0 | no fix listed | DEBIAN-CVE-2026-53704 |
| Debian:14 | gst-plugins-ugly1.0 | 1.28.4-1 | DEBIAN-CVE-2026-53704 |
| 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-2026-53704 |
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-2026-53704 vdb-entry, x_refsource_REDHAT
- RHBZ#2487614 issue-tracking, x_refsource_REDHAT