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Fencer Vulns
medium 6.6

CVE-2026-73433 json

Gstreamer1-plugins-good: gstreamer: unsigned integer underflow in avidemux fujifilm strd parsing leading to out-of-bounds read/write

published 2026-08-12 2 mo ago modified 2026-09-23 47 d ago also EUVD-2026-57444

cvss
6.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gst_avi_demux_parse_strd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains. For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end. Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue. Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072).

Patch / fix

  • GStreamer gst-plugins-good 1.28.6
  • Red Hat Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.5
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-1.el10_0.4
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.10.4-4.el7_9.3
  • Red Hat Red Hat Enterprise Linux 8 0:1.16.1-7.el8_10.3
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.16.1-4.el8_4.2
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_4.2
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.16.1-4.el8_6.3
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_6.3
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.16.1-5.el8_8.3
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.16.1-5.el8_8.3
  • Red Hat Red Hat Enterprise Linux 9 0:1.22.12-7.el9_8.4
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.18.4-8.el9_2.3
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.22.1-4.el9_4.3
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-5.el9_6.3
  • gst-plugins-good1.0 Debian 12 1.22.0-5+deb12u4
  • gst-plugins-good1.0 Debian 14 1.28.6-1

debian advisories DEBIAN-CVE-2026-73433

  • gst-plugins-good1.0 Ubuntu 22.04 LTS 1.20.3-0ubuntu1.10
  • gst-plugins-good1.0 Ubuntu 24.04 LTS 1.24.2-1ubuntu1.8
  • gst-plugins-good1.0 Ubuntu 26.04 LTS 1.28.2-2ubuntu0.4
  • gst-plugins-good1.0 Ubuntu Pro 16.04 LTS 1.8.3-1ubuntu0.5+esm4
  • gst-plugins-good1.0 Ubuntu Pro 18.04 LTS 1.14.5-0ubuntu1~18.04.3+esm4
  • gst-plugins-good1.0 Ubuntu Pro 20.04 LTS 1.16.3-0ubuntu1.3+esm4

ubuntu advisories UBUNTU-CVE-2026-73433

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-good RHEL 8 1.16.1-7.el8_10.3
  • gstreamer1-plugins-good-gtk RHEL 8 1.16.1-7.el8_10.3
  • gstreamer1-plugins-good RHEL 9 1.22.12-7.el9_8.4
  • gstreamer1-plugins-good-gtk RHEL 9 1.22.12-7.el9_8.4
  • gstreamer1-plugins-good RHEL 10.2 1.26.7-2.el10_2.5
  • gstreamer1-plugins-good-gtk RHEL 10.2 1.26.7-2.el10_2.5
  • gstreamer1-plugins-good RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 1.16.1-4.el8_4.2
  • gstreamer1-plugins-good-gtk RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 1.16.1-4.el8_4.2

red hat advisories RHSA-2026:70803RHSA-2026:70584RHSA-2026:70264RHSA-2026:69232RHSA-2026:68642RHSA-2026:68645

  • gstreamer1-plugins-good AlmaLinux 8 1.16.1-7.el8_10.3
  • gstreamer1-plugins-good-gtk AlmaLinux 8 1.16.1-7.el8_10.3
  • gstreamer1-plugins-good AlmaLinux 10 1.26.7-2.el10_2.5
  • gstreamer1-plugins-good-gtk AlmaLinux 10 1.26.7-2.el10_2.5
  • gstreamer1-plugins-good AlmaLinux 9 1.22.12-7.el9_8.4
  • gstreamer1-plugins-good-gtk AlmaLinux 9 1.22.12-7.el9_8.4

almalinux advisories ALSA-2026:56966ALSA-2026:55434ALSA-2026:55436

  • gstreamer1-plugins-good Rocky Linux 8 1.16.1-7.el8_10.3
  • gstreamer1-plugins-good Rocky Linux 10 1.26.7-2.el10_2.5
  • gstreamer1-plugins-good Rocky Linux 9 1.22.12-7.el9_8.4

rocky linux advisories RLSA-2026:56966RLSA-2026:55434RLSA-2026:55436

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-2026-73433 updated cvss 6.6

gstreamer1-plugins-good: gstreamer: unsigned integer underflow in avidemux FUJIFILM strd parsing leading to out-of-bounds read/write

  • Red Hat Enterprise Linux AppStream (v. 8) gstreamer1-plugins-good 1.16.1-7.el8_10.3, gstreamer1-plugins-good-gtk 1.16.1-7.el8_10.3
    fixed: vendor fix RHSA-2026:56966
  • Red Hat Enterprise Linux AppStream (v. 9) gstreamer1-plugins-good 1.22.12-7.el9_8.4, gstreamer1-plugins-good-gtk 1.22.12-7.el9_8.4
    fixed: vendor fix RHSA-2026:55436
  • Red Hat Enterprise Linux AppStream (v. 10) gstreamer1-plugins-good 1.26.7-2.el10_2.5, gstreamer1-plugins-good-gtk 1.26.7-2.el10_2.5
    fixed: vendor fix RHSA-2026:55434
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) gstreamer1-plugins-good 1.16.1-4.el8_4.2, gstreamer1-plugins-good-gtk 1.16.1-4.el8_4.2
    fixed: vendor fix RHSA-2026:70803
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) gstreamer1-plugins-good 1.16.1-4.el8_6.3, gstreamer1-plugins-good-gtk 1.16.1-4.el8_6.3
    fixed: vendor fix RHSA-2026:70584
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) gstreamer1-plugins-good 1.16.1-5.el8_8.3, gstreamer1-plugins-good-gtk 1.16.1-5.el8_8.3
    fixed: vendor fix RHSA-2026:69232
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) gstreamer1-plugins-good 1.18.4-8.el9_2.3, gstreamer1-plugins-good-gtk 1.18.4-8.el9_2.3
    fixed: vendor fix RHSA-2026:68645
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) gstreamer1-plugins-good 1.22.1-4.el9_4.3, gstreamer1-plugins-good-gtk 1.22.1-4.el9_4.3
    fixed: vendor fix RHSA-2026:68642
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) gstreamer1-plugins-good 1.24.11-1.el10_0.4, gstreamer1-plugins-good-gtk 1.24.11-1.el10_0.4
    fixed: vendor fix RHSA-2026:65959
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) gstreamer1-plugins-good 1.22.12-5.el9_6.3, gstreamer1-plugins-good-gtk 1.22.12-5.el9_6.3
    fixed: vendor fix RHSA-2026:68644
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) gstreamer1-plugins-good 1.16.1-4.el8_4.2, gstreamer1-plugins-good-gtk 1.16.1-4.el8_4.2
    fixed: vendor fix RHSA-2026:70803
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) gstreamer1-plugins-good 1.16.1-4.el8_6.3, gstreamer1-plugins-good-gtk 1.16.1-4.el8_6.3
    fixed: vendor fix RHSA-2026:70584
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) gstreamer1-plugins-good 1.16.1-5.el8_8.3, gstreamer1-plugins-good-gtk 1.16.1-5.el8_8.3
    fixed: vendor fix RHSA-2026:69232
  • Red Hat Enterprise Linux Server (v. 7 ELS) gstreamer1-plugins-good 1.10.4-4.el7_9.3
    fixed: vendor fix RHSA-2026:70264

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
2 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.6 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Affected products

  • GStreamer gst-plugins-good
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)

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.