VDB-365629 · Submit #816075 · CVE-2026-9567

GPAC up to 2.4.0 MP4Box isom_intern.c MergeFragment null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.0	$0-$5k	0.00

Summaryinfo

A vulnerability was found in GPAC up to 2.4.0. It has been classified as problematic. Affected by this vulnerability is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2026-9567. The attack can only be executed locally. Furthermore, there is an exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability has been found in GPAC up to 2.4.0 and classified as problematic. Affected by this vulnerability is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-9567. The exploitation appears to be easy. An attack has to be approached locally. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

Applying the patch 525bf1af642c30af04e4df5345e6d798c0a4d8a1 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31945). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Multimedia Player Software

Name

GPAC

Version

License

open-source

Website

Product: https://github.com/gpac/gpac/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 525bf1af642c30af04e4df5345e6d798c0a4d8a1

Timelineinfo

05/26/2026 Advisory disclosed
05/26/2026 +0 days VulDB entry created
05/26/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 3549
Status: Confirmed

CVE: CVE-2026-9567 (🔒)
GCVE (CVE): GCVE-0-2026-9567
GCVE (VulDB): GCVE-100-365629
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/26/2026 12:57
Updated: 05/26/2026 21:59
Changes: 05/26/2026 12:57 (60), 05/26/2026 21:59 (1)
Complete: 🔍
Submitter: fczhang
Cache ID: 216::103

Submitinfo

Accepted

Submit #816075: GPAC MP4Box <= 2.4.0 (master commit 7508ccc and earlier) Null pointer dereference (Denial of Service) (by fczhang)

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