CVE-2026-18649 Red Hat CVE debrief

Who should care

Organizations using the GStreamer gst-plugins-good package should be aware of this vulnerability and take steps to mitigate the risk. This includes reviewing and applying vendor-provided patches or updates, implementing network segmentation and isolation, and monitoring network traffic for suspicious activity.

Technical summary

The rtph264depay and rtph265depay RTP depayloader elements in the GStreamer gst-plugins-good package do not enforce a maximum size limit on the reassembly buffer used during fragmented RTP packet processing. This allows a remote, unauthenticated attacker to send a continuous stream of RTP fragments without ever transmitting an end-of-fragment marker, causing the reassembly buffer to grow without bound until process memory is exhausted, resulting in a denial of service through process termination.

Defensive priority

High-priority defensive actions are required to address this vulnerability, as it can be exploited remotely without authentication, leading to a denial of service.

Recommended defensive actions

• Review and apply vendor-provided patches or updates to address the vulnerability.
• Implement network segmentation and isolation to limit the attack surface.
• Monitor network traffic for suspicious RTP packet activity.
• Consider implementing compensating controls, such as rate limiting or traffic shaping, to mitigate the impact of a potential exploit.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability in the GStreamer gst-plugins-good package. However, the information available is limited, and further analysis is required to fully understand the impact and affected scope.

Official resources