CVE-2026-53703

Name of the Vulnerable Software and Affected Versions GStreamer RealMedia demuxer (gst-plugins-ugly) (affected versions not specified)

Description An out-of-bounds read exists in the RealMedia demuxer when processing RealMedia (.rm) files. The demuxer parses MDPR (media properties) chunks to configure audio streams. For audio stream header versions 4 and 5, the parser reads fields including codec type, packet size, sample rate, channel count, and extra codec data length from fixed offsets without verifying if the chunk contains sufficient data. A specially crafted file with an undersized MDPR chunk can trigger a read beyond the buffer boundary, potentially leading to an application crash or limited information disclosure if the read bytes are incorporated into stream metadata.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.