CVE-2026-92399 GPAC CVE debrief

Who should care

Defenders responsible for systems using GPAC 26.07.0 should assess exposure and prioritize upgrading to version abi-16.26 or later. Defenders should verify if GPAC 26.07.0 is used in their environment and review the official advisory for further details. Defenders should prioritize upgrading to version abi-16.26 or later to mitigate this vulnerability.

Why it matters

CVE-2026-92399 is a heap-based buffer overflow vulnerability in GPAC 26.07.0 WebSocket Handler that can be exploited remotely. Defenders should prioritize upgrading to version abi-16.26 or later.

• Remote attackers may exploit this vulnerability to execute arbitrary code
• Successful exploitation could lead to a denial-of-service condition
• Defenders should verify if GPAC 26.07.0 is used in their environment and upgrade to version abi-16.26 or later
• Exploitation attempts may be detectable through monitoring of WebSocket Handler activity

Technical summary

The vulnerability is caused by a heap-based buffer overflow in the rmt_client_handle_ws_frame function of the GPAC 26.07.0 WebSocket Handler. This can be exploited remotely by manipulating the payload_size argument. The vulnerability affects GPAC 26.07.0, specifically in the function rmt_client_handle_ws_frame of the file src/utils/rmt_ws.c of the component WebSocket Handler. Executing a manipulation of the argument payload_size can lead to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized.

Defensive priority

Defenders should prioritize upgrading to version abi-16.26 or later to mitigate this vulnerability.

Recommended defensive actions

• Upgrade to version abi-16.26 or later
• Review and update affected systems
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was publicly disclosed and an exploit has been made available. However, there is no information on widespread exploitation or specific attacks. Defenders should verify if GPAC 26.07.0 is used in their environment and review the official advisory for further details. The CVE record was published on 2026-09-16T17:18:19.590Z and has not been modified since then. The vulnerability affects the function rmt_client_handle_ws_frame of the file src/utils/rmt_ws.c of the component WebSocket Handler.

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.