CVE-2026-2921 GStreamer CVE debrief

Who should care

Developers and users of GStreamer, particularly those using versions prior to 1.28.1, should be aware of this vulnerability and take steps to mitigate it. This includes applying patches or updates provided by the GStreamer project or using compensating controls to limit exposure. Organizations using GStreamer in their products or services should prioritize patching and ensure that their supply chain is secure.

Technical summary

The vulnerability exists in the handling of palette data in AVI files within GStreamer. When a user opens a specially crafted AVI file, an integer overflow occurs, allowing an attacker to execute arbitrary code in the context of the current process. The issue is caused by a lack of proper validation of user-supplied data. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Defensive priority

High priority should be given to patching or mitigating this vulnerability, as it allows remote code execution and has a high CVSS score. Organizations should prioritize patching and ensure that their supply chain is secure.

Recommended defensive actions

• Apply patches or updates provided by the GStreamer project to address the vulnerability.
• Use compensating controls to limit exposure, such as validating user-supplied data.
• Ensure that GStreamer is updated to version 1.28.1 or later.
• Monitor for suspicious activity, such as unusual AVI file processing.
• Consider implementing additional security controls, such as input validation and error handling.

Evidence notes

The CVE-2026-2921 vulnerability was publicly disclosed on March 16, 2026, and has since been modified on June 30, 2026. The vulnerability is caused by an integer overflow in the handling of palette data in AVI files, which can lead to remote code execution. The GStreamer project has provided patches and updates to address the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.