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Fencer Vulns
high 7.1

CVE-2026-53703 json

Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer audio stream header parser

published 2026-06-15 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-36801

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-1.el10_0.2
  • Red Hat Red Hat Enterprise Linux 9 0:1.22.12-6.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-4.el9_6.1
  • gst-plugins-ugly1.0 Debian 14 1.28.4-1

debian advisories DEBIAN-CVE-2026-53703

  • gst-plugins-ugly1.0 Ubuntu Pro 16.04 LTS 1.8.3-1ubuntu0.1+esm2
  • gst-plugins-ugly1.0 Ubuntu Pro 18.04 LTS 1.14.5-0ubuntu1~18.04.1+esm1
  • gst-plugins-ugly1.0 Ubuntu Pro 20.04 LTS 1.16.2-2ubuntu0.1~esm1
  • gst-plugins-ugly1.0 Ubuntu Pro 22.04 LTS 1.20.1-1ubuntu0.1~esm1
  • gst-plugins-ugly1.0 Ubuntu Pro 24.04 LTS 1.24.1-1ubuntu0.1~esm1
  • gst-plugins-ugly1.0 Ubuntu Pro 26.04 LTS 1.28.2-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-53703

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gstreamer1-plugins-ugly-free RHEL 9 1.22.12-6.el9_8.1
  • gstreamer1-plugins-ugly-free RHEL 10.2 1.26.7-2.el10_2.1
  • gstreamer1-plugins-ugly-free RHEL 9.6 EUS 1.22.12-4.el9_6.1
  • gstreamer1-plugins-ugly-free enterprise linux eus 10.0 1.24.11-1.el10_0.2

red hat advisories RHSA-2026:50691RHSA-2026:50688RHSA-2026:36674RHSA-2026:36673

  • gstreamer1-plugins-ugly-free AlmaLinux 10 1.26.7-2.el10_2.1
  • gstreamer1-plugins-ugly-free AlmaLinux 9 1.22.12-6.el9_8.1

almalinux advisories ALSA-2026:36673ALSA-2026:36674

  • gstreamer1-plugins-ugly-free Rocky Linux 10 1.26.7-2.el10_2.1
  • gstreamer1-plugins-ugly-free Rocky Linux 9 1.22.12-6.el9_8.1

rocky linux advisories RLSA-2026:36673RLSA-2026:36674

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53703 updated cvss 7.1

gstreamer1-plugins-ugly-free: GStreamer: Out-of-bounds read in RealMedia demuxer audio stream header parser

  • Red Hat Enterprise Linux AppStream (v. 9) gstreamer1-plugins-ugly-free 1.22.12-6.el9_8.1
    fixed: vendor fix RHSA-2026:36674
  • Red Hat Enterprise Linux AppStream (v. 10) gstreamer1-plugins-ugly-free 1.26.7-2.el10_2.1
    fixed: vendor fix RHSA-2026:36673
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) gstreamer1-plugins-ugly-free 1.24.11-1.el10_0.2
    fixed: vendor fix RHSA-2026:50688
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) gstreamer1-plugins-ugly-free 1.22.12-4.el9_6.1
    fixed: vendor fix RHSA-2026:50691
  • Red Hat Enterprise Linux 7 gstreamer1-plugins-ugly-free 1.10.4-3.el7
    not affected: component not present
  • Red Hat Enterprise Linux 8 gstreamer1-plugins-ugly-free, gstreamer1-plugins-ugly-free 1.10.4-3.el7
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected products

  • 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

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.