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Advisory severityHigh7.1Vendor: MediumRed Hat Linux

High [CVE-2026-53703] out-of-bounds read in realmedia demuxer audio stream header parser

This high-severity Red Hat Linux advisory covers CVE-2026-53703 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat package: gstreamer1-plugins-ugly-free.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-53703 Source published Source updated

VulniPulse record published

CVE-2026-53703
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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. This flaw affects gstreamer1-plugins-ugly-free as shipped in Red Hat Enterprise Linux.

RealMedia is a legacy container format with limited real-world usage. No code execution or memory corruption path has been identified.

No upstream fix is available yet as the surrounding rmdemux code requires a broader rewrite. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H).

Weakness: CWE-125.

Is CVE-2026-53703 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53703 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53703?

Upgrade to a fixed release named by Red Hat:

  • gstreamer1-plugins-ugly-free-0:1.26.7-2.el10_2.1
  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2
  • gstreamer1-plugins-ugly-free-0:1.22.12-6.el9_8.1
  • gstreamer1-plugins-ugly-free-0:1.22.12-4.el9_6.1
  • RHSA-2026:36673
  • RHSA-2026:50688
  • RHSA-2026:36674
  • RHSA-2026:50691

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • gstreamer1-plugins-ugly-free-0:1.26.7-2.el10_2.1
  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2
  • gstreamer1-plugins-ugly-free-0:1.22.12-6.el9_8.1
  • gstreamer1-plugins-ugly-free-0:1.22.12-4.el9_6.1
  • RHSA-2026:36673
  • RHSA-2026:50688
  • RHSA-2026:36674
  • RHSA-2026:50691

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

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