CVE-2026-108538
Deferred Deferred - Pending Action

Use After Free in GPAC MP4Box via gf_mx_v

Vulnerability report for CVE-2026-108538, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-11

Last updated on: 2026-10-11

Assigner: VulDB

Description

A security vulnerability has been detected in GPAC up to 26.07.0. The impacted element is the function gf_mx_v of the file utils/os_thread.c of the component MP4Box. Such manipulation leads to use after free. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Scores

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Meta Information

Published
2026-10-11
Last Modified
2026-10-11
Generated
2026-10-11
AI Q&A
2026-10-11
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
n/a GPAC 26.07

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

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Executive Summary

This vulnerability is a use-after-free issue in GPAC up to version 26.07.0, specifically in the function gf_mx_v of the file utils/os_thread.c within the MP4Box component. Use-after-free occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution. The attack can be launched remotely, and a public exploit is available.

Detection Guidance

This vulnerability is specific to GPAC versions up to 26.07.0 and involves a use-after-free issue in the gf_mx_v function of utils/os_thread.c. Detection requires checking GPAC version and analyzing MP4Box usage. No direct network detection commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system, crash applications, or gain unauthorized access. Since GPAC is used for media processing, malicious MP4 files could trigger the issue. The impact depends on the privileges of the affected application and whether the exploit is triggered locally or remotely.

Compliance Impact

This vulnerability could lead to unauthorized data access or system compromise, which may violate GDPR (data protection) or HIPAA (health data privacy) if exploited. Organizations using vulnerable GPAC versions risk non-compliance due to potential data breaches or loss of confidentiality. Immediate patching is advised to maintain regulatory compliance.

Mitigation Strategies

Update GPAC to the latest version beyond 26.07.0 to address the use-after-free vulnerability in the gf_mx_v function of utils/os_thread.c. If an update is unavailable, consider disabling MP4Box functionality or restricting network access to it until a patch is released.

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