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Fencer Vulns
high 7.1

CVE-2026-53704 json

Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer fileinfo metadata parser

published 2026-06-15 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-36802

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 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.

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-2026-53704

  • 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-2026-53704

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 9 1.22.12-6.el9_8.1

rocky linux advisories RLSA-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-2026-53704 updated cvss 7.1

gstreamer1-plugins-ugly-free: GStreamer: Out-of-bounds read in RealMedia demuxer FILEINFO metadata 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 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.