CVE-2026-73433
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.
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.6 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- gstreamer/gstreamer · redhat/enterprise linux
- Source
- secalert@redhat.com
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/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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.