Security Flaw in GPAC MP4Box Affects Media Processing Capabilities
CVE-2026-7135

4.8MEDIUM

Key Information:

Vendor

GPAC

Status
Gpac
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7135?

A security flaw has been identified in GPAC's MP4Box component, specifically within the elng_box_read function located in src/isomedia/box_code_base.c. This vulnerability facilitates an out-of-bounds read when the elng argument is manipulated. The exploit requires local access and has been made publicly available, raising concerns for users of affected versions. It is strongly recommended to apply the provided patch (cf6ac48c972eaaee2af270adc3f36615325deb3e) to mitigate potential risks.

Affected Version(s)

GPAC 26.03-DEV-rev105-g8f39a1eb3-master

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-2026-7135 - Proof of Concept

References

https://vuldb.com/vuln/359734
vdb-entrytechnical-description
https://vuldb.com/vuln/359734/cti
signaturepermissions-required
https://vuldb.com/submit/800985
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
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

Lucian-2333 (VulDB User)
.