# CVE-2026-3084: GStreamer H.266 Codec Parser integer underflow in picture partitions

Source: https://junglewise.ai/threats/cve-2026-3084-gstreamer-h-266-codec-parser-integer-underflow-in-picture  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-16. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-3084 · Severity: high · CVSS 7.8 · Published 2026-03-16

GStreamer is a widely used multimedia framework for processing audio and video. A security flaw in its H.266 video codec parser could allow an attacker to execute malicious code on a user's system if they are tricked into opening a specially crafted video file. This could lead to a full system compromise, data theft, or unauthorized access to the user's environment.

Technologies: [Gstreamer Gst-Plugins-Bad](https://junglewise.ai/threats/technologies/gst-plugins-bad), [Gstreamer](https://junglewise.ai/threats/technologies/gstreamer), [Red Hat Enterprise Linux 6](https://junglewise.ai/threats/technologies/enterprise-linux-6), [Red Hat Enterprise Linux 8](https://junglewise.ai/threats/technologies/enterprise-linux-8). Vendors: [Gstreamer](https://junglewise.ai/threats/vendors/gstreamer), [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-3084 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-3084 being exploited in the wild.

**How severe is CVE-2026-3084?** High severity, with a CVSS score of 7.8, published 16 March 2026.

**Which products and versions are affected?** Gstreamer Gst-Plugins-Bad < 1.28.1; Red Hat Enterprise Linux 6 affected; Red Hat Enterprise Linux 8 affected.

**Is there a fix for CVE-2026-3084?** A patch was published on 2026-02-25: Fix committed to GStreamer repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-3084 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-3084?** Check whether you run Gstreamer Gst-Plugins-Bad, Gstreamer, Red Hat Enterprise Linux 6 or one of the others listed 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.

## Technical details

An integer underflow vulnerability exists in the GStreamer H.266 video bitstream parser within the 'gst-plugins-bad' package. The flaw is located in the parsing of picture partitions, where a lack of proper validation of user-supplied data leads to an underflow before a memory write operation. While categorized as local/user-interaction required, an attacker can exploit this by providing a malicious H.266 video file to an application using the GStreamer library. Successful exploitation can result in an out-of-bounds write, potentially leading to arbitrary code execution in the context of the process. The issue is addressed in GStreamer version 1.28.1.

## Affected products

- GStreamer GStreamer gst-plugins-bad < 1.28.1
- Red Hat Enterprise Linux 6 affected
- Red Hat Enterprise Linux 8 affected

## Timeline

- 2026-02-11: disclosed: Vulnerability reported to vendor
- 2026-02-25: patched: Fix committed to GStreamer repository
- 2026-03-06: advisory: Coordinated public release of ZDI advisory
- 2026-03-16: advisory: NVD publication date

## References

- [https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/496e4f296e658fba7fd40027d3bbe6095633ec91](https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/496e4f296e658fba7fd40027d3bbe6095633ec91)
- [https://www.zerodayinitiative.com/advisories/ZDI-26-169/](https://www.zerodayinitiative.com/advisories/ZDI-26-169/)
- [https://access.redhat.com/security/cve/CVE-2026-3084](https://access.redhat.com/security/cve/CVE-2026-3084)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2447483](https://bugzilla.redhat.com/show_bug.cgi?id=2447483)
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3084.json](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3084.json)

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