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).

• CWE-191

• 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/security/cve/CVE-2026-73433Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2514801Issue Tracking, Third Party Advisory
• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231Issue Tracking
• https://gstreamer.freedesktop.org/security/sa-2026-0072.htmlPatch, Vendor Advisory

Published

Aug 12, 2026

Last Modified

Aug 19, 2026

Status

Modified

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