CVE-2026-73433
Publication date 13 August 2026
Last updated 14 August 2026
Ubuntu priority
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).
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| gst-plugins-good1.0 | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
6.6 · Medium
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-73433
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12241
- https://gstreamer.freedesktop.org/security/sa-2026-0072.html
- https://access.redhat.com/security/cve/CVE-2026-73433
- https://bugzilla.redhat.com/show_bug.cgi?id=2514801