Integer overflow in Gstreamer Gst-Plugins-Good
CVE-2026-73433
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).
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.001 (3.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Gstreamer Gst-Plugins-Good — versions 0
- Gstreamer
- Red Hat Enterprise Linux 10 — versions 0:1.26.7-2.el10_2.5
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:1.22.12-7.el9_8.4
- Red Hat Enterprise Linux — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-73433 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231 (Issue Tracking)
- gstreamer.freedesktop.org/security/sa-2026-0072.html (Patch, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:55434 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2026:55436 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2026:56966 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:65959 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68645 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68644 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-73433?
- CVE-2026-73433 is a medium-severity vulnerability in Gstreamer Gst-Plugins-Good, classified under Integer Underflow. CVSS score: 6.6/10. Published 2026-08-12.
- How severe is CVE-2026-73433?
- Medium severity. CVSS v3 base score is 6.6 out of 10.