What is CVE-2026-18299?

CVE-2026-18299 is a high-severity vulnerability in Gstreamer, classified under Use After Free. CVSS score: 7.8/10. Published 2026-08-20.

How severe is CVE-2026-18299?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Gstreamer

CVE-2026-18299

GStreamer rtpsbcdepay Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the processing of RTP payload elements. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29787.

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Gstreamer — versions 99fde1184fe8b12d0721230941c1bf2080913183

Weakness classification (CWE)

CWE-416 — Use After Free

References

zdi-disclosures@trendmicro.com (x_research-advisory)
zdi-disclosures@trendmicro.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-18299?: CVE-2026-18299 is a high-severity vulnerability in Gstreamer, classified under Use After Free. CVSS score: 7.8/10. Published 2026-08-20.
How severe is CVE-2026-18299?: High severity. CVSS v3 base score is 7.8 out of 10.