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CVE-2026-3086 GStreamer CVE debrief

CVE-2026-3086 is a high-severity vulnerability in the GStreamer library, specifically in the H.266 codec parser. This vulnerability, tracked as ZDI-CAN-28911, enables remote attackers to execute arbitrary code on affected installations of GStreamer. The flaw exists within the processing of APS units and results from the lack of proper validation of user-supplied data, which can lead to a write past the end of an allocated buffer. Successful exploitation allows an attacker to execute code in the context of the current process. The Common Vulnerability Scoring System (CVSS) scores this vulnerability at 7.8, indicating a high severity level.

Vendor
GStreamer
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-16
Original CVE updated
2026-06-30
Advisory published
2026-03-16
Advisory updated
2026-06-30

Who should care

Organizations and developers using GStreamer in their applications should be aware of this vulnerability. Given the high severity and potential for remote code execution, immediate attention is required to assess the risk and apply necessary patches or mitigations. This vulnerability's impact could be significant, especially in environments where GStreamer is used in conjunction with untrusted input sources.

Technical summary

The vulnerability is located in the H.266 codec parser of GStreamer, specifically in the handling of APS units. The issue arises from inadequate validation of user-supplied data, which can cause an out-of-bounds write. This type of vulnerability can be exploited remotely, and successful exploitation could lead to arbitrary code execution in the context of the current process. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating a high severity level.

Defensive priority

High priority should be given to patching or mitigating this vulnerability due to its high CVSS score and the potential for remote code execution. Organizations should review their GStreamer installations and apply patches or updates as soon as available.

Recommended defensive actions

  • Assess GStreamer installations for vulnerability to CVE-2026-3086.
  • Apply patches or updates provided by GStreamer to address the vulnerability.
  • Implement compensating controls to monitor and restrict input to GStreamer installations.
  • Review and update security policies to include checks for GStreamer vulnerabilities.
  • Monitor for and respond to potential exploitation attempts targeting CVE-2026-3086.

Evidence notes

The CVE-2026-3086 vulnerability was publicly disclosed on March 16, 2026, and has since been modified on June 30, 2026. The vulnerability is associated with CWE-787, indicating an out-of-bounds write issue. Multiple sources, including NVD and ZDI, have documented this vulnerability, providing details on its impact and potential mitigations.

Official resources

This article is AI-assisted and based on the supplied source corpus.