Use After Free Vulnerability in GPAC MP4Box by GPAC
CVE-2026-108539

5.3MEDIUM

Key Information:

Vendor

GPAC

Status
Gpac
Vendor
CVE Published:
11 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-108539?

A vulnerability in GPAC's MP4Box component has been identified, specifically in the function gf_fq_pop located in filter_core/filter_queue.c. This issue manifests as a use after free condition, allowing attackers to exploit this flaw remotely. The exploit, which is now publicly available, poses significant risks to users of the affected GPAC products. Despite early disclosure attempts to the vendor, there has been no response, raising concerns about remediation efforts.

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-2026-108539 - Proof of Concept

References

https://vuldb.com/vuln/416194
vdb-entrytechnical-description
https://vuldb.com/vuln/416194/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-108539
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:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ziiiro (VulDB User)
VulDB CNA Team
.