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Advisory severityHigh7.1Vendor: MediumRed Hat Linux

High [CVE-2026-53704] out-of-bounds read in realmedia demuxer fileinfo metadata parser

This high-severity Red Hat Linux advisory covers CVE-2026-53704 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-2026-53704 Source published Source updated

VulniPulse record published

CVE-2026-53704
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

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.

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.

The upstream maintainer confirmed only out-of-bounds reads are present, which can lead to crashes and possible limited information disclosure. 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. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.6 Extended Update Support.

Is CVE-2026-53704 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53704 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-2026-53704?

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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