Use After Free Vulnerability in GPAC's MP4Box Component
CVE-2026-108538

5.3MEDIUM

Key Information:

Vendor

GPAC

Status
Gpac
Vendor
CVE Published:
11 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-108538?

A use after free vulnerability in the MP4Box component of GPAC, found in the function gf_mx_v of utils/os_thread.c, allows remote attackers to manipulate memory, potentially leading to exploitation. The issue exists in versions up to 26.07.0. Despite being disclosed publicly, the vendor did not respond to initial contact regarding this vulnerability, raising concerns about its potential usage in attacks.

Affected Version(s)

GPAC 26.07

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-2026-108538 - Proof of Concept

References

https://vuldb.com/vuln/416193
vdb-entrytechnical-description
https://vuldb.com/vuln/416193/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-108538
third-party-advisory

CVSS V4

Score:
5.3
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

ziiiro (VulDB User)
VulDB CNA Team
.