# CVE-2026-73473: Gstreamer1-plugins-good: gstreamer: missing subindex entry count validation in avidemux leading to denial of service

Status: published. Published: 2026-11-06. Updated: 2026-11-06.

A flaw was found in GStreamer gst-plugins-good (avidemux). In the subindex parser, missing validation of the entry count can cause excessive memory allocation and denial of service. Because avidemux is auto-plugged by playbin, decodebin, and gst-discoverer, 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).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- GStreamer / gst-plugins-good (gst-plugins-good): ≥ 0; < 1.28.6 (affected, semver). Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-73473 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2514915 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231 (CNA: redhat)

- https://gstreamer.freedesktop.org/security/sa-2026-0072.html (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-73473; retrieved 2026-11-06; source updated 2026-11-06

Revision: 4d9588039a38bf8719270387cf64d28a5b183e62559ae98f875e766180fa103c

Canonical: https://y2.dev/cve/CVE-2026-73473

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