# CVE-2026-119843: Gst-plugins-good: assertion failures in FLV demuxer when parsing malformed enhanced audio/video tags

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

A flaw was found in GStreamer's gst-plugins-good package. The FLV media demuxer does not properly validate buffer sizes and data availability when processing enhanced audio and video tags in malformed or truncated FLV streams. A remote attacker could exploit this vulnerability by providing a specially crafted FLV media file that, when opened or streamed by a GStreamer-based application, triggers an assertion failure or a process crash, leading to denial of service.

## Remediation

- workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1-plugins-good): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer1-plugins-good): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1-plugins-good): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1-plugins-good): Version range not reported. Source: CNA: redhat
- GStreamer project / gst-plugins-good: ≥ 0; < 1.28.2 (affected, semver); 1.28.2 (unaffected). Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-617

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-119843 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2564182 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11244.patch (CNA: redhat)

- https://gstreamer.freedesktop.org/security/sa-2026-0020.html (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-119843 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2564182 (secalert@redhat.com)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11244.patch (secalert@redhat.com)

- https://gstreamer.freedesktop.org/security/sa-2026-0020.html (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-119843; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119843; retrieved 2026-11-03; source updated 2026-11-03

Revision: ae8863a69440053bbf209d23ac59eb51b63582889db68b42b56e61472cd38d81

Canonical: https://y2.dev/cve/CVE-2026-119843

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