Heap-based Buffer Overflow in GPAC WebSocket Handler
CVE-2026-92399

6.9MEDIUM

Key Information:

Vendor

GPAC

Status
Gpac
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-92399?

A vulnerability exists in GPAC version 26.07.0 within the WebSocket Handler, specifically in the rmt_client_handle_ws_frame function of the rmt_ws.c file. This vulnerability stems from the manipulation of the argument payload_size, leading to a heap-based buffer overflow. The exploit is remote and has been publicly disclosed, making it critical for users to take action. It is recommended to upgrade to version abi-16.26 to mitigate this issue, where an official patch has been implemented for this vulnerability.

Affected Version(s)

GPAC 26.07.0

GPAC abi-16.26

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-92399 - Proof of Concept

References

https://vuldb.com/vuln/405551
vdb-entrytechnical-description
https://vuldb.com/vuln/405551/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-92399
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

JerryGW (VulDB User)
.