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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gst-plugins-ugly1.0 | 1.28.4-1 | — |
| Debian 13 | gst-plugins-ugly1.0 | No fix yet | — |
| Debian 12 | gst-plugins-ugly1.0 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | gst-plugins-ugly1.0 | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | gst-plugins-ugly1.0 | 1.28.2-1ubuntu0.1~esm1 | USN-8896-1 |
| Ubuntu Pro 24.04 LTS | gst-plugins-ugly1.0 | 1.24.1-1ubuntu0.1~esm1 | USN-8896-1 |
| Ubuntu Pro 22.04 LTS | gst-plugins-ugly1.0 | 1.20.1-1ubuntu0.1~esm1 | USN-8896-1 |
| Ubuntu Pro 20.04 LTS | gst-plugins-ugly1.0 | 1.16.2-2ubuntu0.1~esm1 | USN-8896-1 |
| Ubuntu Pro 18.04 LTS | gst-plugins-ugly1.0 | 1.14.5-0ubuntu1~18.04.1+esm1 | USN-8896-1 |
| Ubuntu Pro 16.04 LTS | gst-plugins-ugly1.0 | 1.8.3-1ubuntu0.1+esm2 | USN-8896-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | gstreamer1-plugins-ugly-free | 1.26.7-2.el10_2.1 | RHSA-2026:36673 |
| RHEL 9 | gstreamer1-plugins-ugly-free | 1.22.12-6.el9_8.1 | RHSA-2026:36674 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | gstreamer1-plugins-ugly-free | 1.24.11-1.el10_0.2 | RHSA-2026:50688 |
| RHEL 9.6 EUS | gstreamer1-plugins-ugly-free | 1.22.12-4.el9_6.1 | RHSA-2026:50691 |
AlmaLinux
Errata ↗| Release | 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 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | gstreamer1-plugins-ugly-free | 1.22.12-6.el9_8.1 | RLSA-2026:36674 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | gstreamer1-plugins-ugly-free | 1.22.12-6.el9_8.1 | ELSA-2026-36674 |
Advisories 10
- ALSA-2026:36673 Moderate: gstreamer1-plugins-ugly-free security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:36674 Moderate: gstreamer1-plugins-ugly-free security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-1919 GStreamer: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2026
- USN-8896-1 gst-plugins-ugly1.0 vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- RHSA-2026:36673 Red Hat Security Advisory: gstreamer1-plugins-ugly-free security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:50688 Red Hat Security Advisory: gstreamer1-plugins-ugly-free security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:50691 Red Hat Security Advisory: gstreamer1-plugins-ugly-free security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:36674 Red Hat Security Advisory: gstreamer1-plugins-ugly-free security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RLSA-2026:36674 Moderate: gstreamer1-plugins-ugly-free security update Rocky Linux Security Advisories · Jul 10, 2026
- ELSA-2026-36674 Moderate: gstreamer1-plugins-ugly-free security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
References
- RHSA-2026:36673 vendor-advisory
- RHSA-2026:36674 vendor-advisory
- RHSA-2026:50688 vendor-advisory
- RHSA-2026:50691 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-53704 vdb-entry
- RHBZ#2487614 issue-tracking