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Vulnerability · Published Aug 12, 2026 · Assigned by redhat

CVE-2026-73433Gstreamer1-plugins-good: gstreamer: unsigned integer underflow in avidemux fujifilm strd parsing leading to out-of-bounds read/write

Medium 6.6

In plain English

A medium-severity security flaw in gst-plugins-good from GStreamer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.6Medium
Exploit odds (30 days)0.1%top 95.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10gstreamer1-plugins-good1.26.7-2.el10_2.5ALSA-2026:55434
AlmaLinux:8gstreamer1-plugins-good1.16.1-7.el8_10.3ALSA-2026:56966
AlmaLinux:9gstreamer1-plugins-good1.22.12-7.el9_8.4ALSA-2026:55436
AlmaLinux:10gstreamer1-plugins-good-gtk1.26.7-2.el10_2.5ALSA-2026:55434
AlmaLinux:8gstreamer1-plugins-good-gtk1.16.1-7.el8_10.3ALSA-2026:56966
AlmaLinux:9gstreamer1-plugins-good-gtk1.22.12-7.el9_8.4ALSA-2026:55436
Debian:12gst-plugins-good1.01.22.0-5+deb12u4DEBIAN-CVE-2026-73433
Debian:13gst-plugins-good1.0no fix listedDEBIAN-CVE-2026-73433
Debian:14gst-plugins-good1.01.28.6-1DEBIAN-CVE-2026-73433
Rocky Linux:10gstreamer1-plugins-good0:1.26.7-2.el10_2.5RLSA-2026:55434
Rocky Linux:8gstreamer1-plugins-good0:1.16.1-7.el8_10.3RLSA-2026:56966
Rocky Linux:9gstreamer1-plugins-good0:1.22.12-7.el9_8.4RLSA-2026:55436
Ubuntu:22.04:LTSgst-plugins-good1.01.20.3-0ubuntu1.10UBUNTU-CVE-2026-73433
Ubuntu:22.04:LTSgst-plugins-good1.01.20.3-0ubuntu1.10USN-8863-1
Ubuntu:24.04:LTSgst-plugins-good1.01.24.2-1ubuntu1.8USN-8863-1
Ubuntu:24.04:LTSgst-plugins-good1.01.24.2-1ubuntu1.8UBUNTU-CVE-2026-73433
Ubuntu:26.04:LTSgst-plugins-good1.01.28.2-2ubuntu0.4USN-8863-1
Ubuntu:26.04:LTSgst-plugins-good1.01.28.2-2ubuntu0.4UBUNTU-CVE-2026-73433

Affected products (as reported)

VendorProductVersions
GStreamer gst-plugins-good 0 – before 1.28.6
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references

Weakness: CWE-191 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

References