# CVE-2026-119843: GStreamer gst-plugins-good FLV demuxer buffer validation DoS

Source: https://junglewise.ai/threats/cve-2026-119843-a-flaw-was-found-in-gstreamer-s-gst-plugins-good-package-the-flv  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-119843 · Severity: medium · CVSS 6.5 · Published 2026-11-03

GStreamer is an open-source multimedia framework used in media players, streaming applications, and WebRTC systems to handle audio and video processing. A flaw in its FLV (Flash Video) file parser allows attackers to crash GStreamer-based applications by providing malformed video files, causing service disruption or application instability.

Technologies: [Gstreamer Gst-Plugins-Good](https://junglewise.ai/threats/technologies/gstreamer-gst-plugins-good). Vendors: [Gstreamer](https://junglewise.ai/threats/vendors/gstreamer).

## Quick answers

**Is CVE-2026-119843 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119843 being exploited in the wild.

**How severe is CVE-2026-119843?** Medium severity, with a CVSS score of 6.5, published 3 November 2026.

**Which products and versions are affected?** GStreamer gst-plugins-good.

**Is there a fix for CVE-2026-119843?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-119843 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-119843?** Check whether you run Gstreamer Gst-Plugins-Good. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The FLV media demuxer in gst-plugins-good fails to properly validate buffer sizes and data availability when processing enhanced audio and video tags in malformed or truncated FLV streams. An unauthenticated remote attacker can trigger assertion failures or process crashes by supplying a specially crafted FLV file, resulting in denial of service against any GStreamer-based application that attempts to process the malicious media.

## Affected products

- GStreamer gst-plugins-good

## Timeline

- 2026-11-03: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://gstreamer.freedesktop.org/](https://gstreamer.freedesktop.org/)

## Related threats

- [GStreamer gst-plugins-good out-of-bounds heap read in qtdemux](https://junglewise.ai/threats/cve-2026-125041-a-flaw-was-found-in-gstreamer-s-gst-plugins-good-mov-mp4-demuxer)
- [GStreamer gst-plugins-good H.264 RTP depayloader heap read overflow](https://junglewise.ai/threats/cve-2026-119610-a-flaw-was-found-in-gstreamer-s-gst-plugins-good-specifically-in)
- [GStreamer adaptive streaming demuxers local file disclosure via unvalidated URIs](https://junglewise.ai/threats/cve-2026-121629-a-flaw-was-found-in-gstreamer-s-adaptive-streaming-demuxers-hls)
- [GStreamer gst-plugins-good avidemux denial of service](https://junglewise.ai/threats/cve-2026-73473-a-flaw-was-found-in-gstreamer-gst-plugins-good-avidemux-in-the)
- [GStreamer gst-plugins-good integer overflow in AVI parser](https://junglewise.ai/threats/cve-2026-73472-a-flaw-was-found-in-gstreamer-gst-plugins-good-avidemux-in-the)