# CVE-2026-125703: GStreamer gst-plugins-bad MXF plugin buffer overflow in VANC handling

Source: https://junglewise.ai/threats/cve-2026-125703-a-flaw-was-found-in-the-gstreamer-gst-plugins-bad-mxf-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-125703 · Severity: medium · CVSS 5.5 · Published 2026-11-10

GStreamer's MXF media plugin contains flaws in how it processes video metadata packets (VANC data), allowing a malicious video file to crash applications that play or process it. An attacker can craft a specially formatted MXF video file that, when opened, causes the application to read or write memory incorrectly and crash, resulting in denial of service. No data theft or system compromise occurs, but legitimate video processing workflows could be disrupted.

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

## Quick answers

**Is CVE-2026-125703 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-125703 being exploited in the wild.

**How severe is CVE-2026-125703?** Medium severity, with a CVSS score of 5.5, published 10 November 2026.

**Which products and versions are affected?** Gstreamer Gst-Plugins-Bad versions through affected range prior to fix (RHEL 6 ELS, 7 ELS, 8, 9, 10 through 10.3).

**Is there a fix for CVE-2026-125703?** No fixed version is recorded yet. If MXF support is not required, disable the MXF plugin in affected GStreamer applications. Otherwise, restrict MXF inputs to trusted sources only.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-11-10"}] 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-2026-125703 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-125703?** Check whether you run Gstreamer Gst-Plugins-Bad at an affected version. 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.

## How to fix


If MXF support is not required, disable the MXF plugin in affected GStreamer applications. Otherwise, restrict MXF inputs to trusted sources only.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-11-10"}]

## Technical details

The MXF demuxer has insufficient bounds checking when parsing crafted VANC (Vertical Ancillary) data, enabling out-of-bounds reads, and the muxer miscalculates buffer size when handling multiple ancillary packets, enabling out-of-bounds writes. Both conditions are triggered by parsing or processing a malicious MXF file locally (local attack vector, requires user interaction to open the file). The flaws result in application crashes and potential memory corruption, with no fix version stated in the advisory.

## Affected products

- GStreamer gst-plugins-bad versions through affected range prior to fix (RHEL 6 ELS, 7 ELS, 8, 9, 10 through 10.3)

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-125703](https://access.redhat.com/security/cve/CVE-2026-125703)

## Related threats

- [GStreamer gst-plugins-bad out-of-bounds read in MPEG/DVD parsing](https://junglewise.ai/threats/cve-2026-125706-a-flaw-was-found-in-gstreamer-s-gst-plugins-bad-mpeg-program)
- [GStreamer gst-plugins-bad H.265 uninitialized memory use](https://junglewise.ai/threats/cve-2026-121611-a-flaw-was-found-in-gstreamer-s-gst-plugins-bad-package-a-use-of)
- [GStreamer MXF demuxer out-of-bounds read](https://junglewise.ai/threats/cve-2026-121601-a-flaw-was-found-in-gstreamer-s-mxf-demuxer-plugin-gst-plugins)
- [GStreamer gst-plugins-bad JPEG 2000 decimator integer overflow and division by zero](https://junglewise.ai/threats/cve-2026-121259-a-flaw-was-found-in-the-gstreamer-jpeg-2000-decimator-in-gst)
- [GStreamer gst-plugins-bad NULL pointer dereference in H.264 MVC parser](https://junglewise.ai/threats/cve-2026-119728-a-flaw-was-found-in-the-h-264-video-parser-in-gst-plugins-bad)