Vulnerability 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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gstreamer | Gstreamer | <= 1.28.6 |
| Redhat | Enterprise Linux | 7.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:55434Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:55436Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:56966
- https://access.redhat.com/errata/RHSA-2026:65959
- https://access.redhat.com/errata/RHSA-2026:68642
- https://access.redhat.com/errata/RHSA-2026:68644
- https://access.redhat.com/errata/RHSA-2026:68645
- https://access.redhat.com/security/cve/CVE-2026-73433Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2514801Issue TrackingThird Party Advisory
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231Issue Tracking
- https://gstreamer.freedesktop.org/security/sa-2026-0072.htmlPatchVendor Advisory
FAQ
What is CVE-2026-73433?
CVE-2026-73433 is a vulnerability with a CVSS score of 6.6 (MEDIUM). 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 an...
How severe is CVE-2026-73433?
CVE-2026-73433 has been rated MEDIUM with a CVSS base score of 6.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73433?
Check the references section above for vendor advisories and patch information. Affected products include: Gstreamer Gstreamer, Redhat Enterprise Linux.