---
id: CVE-2026-53704
title: >-
  A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly
  package
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…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: Red Hat
product: gstreamer1-plugins-ugly-free
affected:
  - gstreamer1-plugins-ugly-free (all versions)
  - gstreamer1-plugins-ugly-free (all versions)
  - gstreamer1-plugins-ugly-free (all versions)
  - gstreamer1-plugins-ugly-free (all versions)
  - gstreamer1-plugins-ugly-free
  - gstreamer1-plugins-ugly-free
published: '2026-06-15'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T23:17:25.130'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53704'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:36673'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:36674'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50688'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50691'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-53704'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2487614'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53704.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-53704'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53704'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-16T12:46:47.069346Z'
epss: 0.00245
epssPercentile: 0.1598
ingestedAt: '2026-09-08T23:13:54.647Z'
patched:
  - enterprise_linux_appstream_eus_v_10_0
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_eus_v_9_6
  - enterprise_linux_appstream_v_9
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:50688** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-08-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:50688)
- **RHSA-2026:36673** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36673)
- **RHSA-2026:50691** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-08-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:50691)
- **RHSA-2026:36674** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36674)