CVE-2026-73433Gstreamer1-plugins-good: gstreamer: unsigned integer underflow in avidemux fujifilm strd parsing leading to out-of-bounds read/write

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).

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• RHSA-2026:55434 vendor-advisoryThird Party Advisory
• RHSA-2026:55436 vendor-advisoryThird Party Advisory
• RHSA-2026:56966 vendor-advisory
• RHSA-2026:65959 vendor-advisory
• RHSA-2026:68642 vendor-advisory
• RHSA-2026:68644 vendor-advisory
• RHSA-2026:68645 vendor-advisory
• RHSA-2026:69232 vendor-advisory
• RHSA-2026:70264 vendor-advisory
• RHSA-2026:70584 vendor-advisory
• RHSA-2026:70803 vendor-advisory
• https://access.redhat.com/security/cve/CVE-2026-73433 vdb-entryThird Party Advisory
• RHBZ#2514801 issue-trackingIssue TrackingThird Party Advisory
• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231 Issue Tracking
• https://gstreamer.freedesktop.org/security/sa-2026-0072.html PatchVendor Advisory