Executive brief
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.
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://www.zerodayinitiative.com/advisories/ZDI-26-169/
- https://access.redhat.com/security/cve/CVE-2026-3084
- https://bugzilla.redhat.com/show_bug.cgi?id=2447483
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3084.json