CVE-2026-12891
Medium · 4.3CVSS
4.3
EPSS
0.4%
Published
Jun 23, 2026
CISA due date
—
The record
A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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