CVE-2025-70308: GPAC GSF Demuxer DoS Vulnerability

CVE-2025-70308 Overview

CVE-2025-70308 is an out-of-bounds read vulnerability in the GSF demuxer filter component of GPAC v2.4.0. This memory corruption vulnerability allows attackers to cause a Denial of Service (DoS) condition by supplying a specially crafted .gsf file to the vulnerable application. The vulnerability stems from improper boundary validation when processing GSF media container files.

Critical Impact

Attackers can exploit this vulnerability to crash GPAC applications by providing malicious GSF files, potentially disrupting media processing workflows and services that rely on GPAC for multimedia handling.

Affected Products

• GPAC v2.4.0
• Applications and services utilizing GPAC GSF demuxer filter component
• Systems processing untrusted GSF media files through GPAC

Discovery Timeline

• 2026-01-15 - CVE CVE-2025-70308 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-70308

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory corruption issue that occurs when the software reads data past the boundaries of an allocated memory buffer. In the context of GPAC's GSF demuxer filter, the vulnerability is triggered when parsing malformed or maliciously crafted GSF (GPAC Streaming Format) files.

When GPAC processes a GSF file, the demuxer filter parses the container structure to extract media streams. The vulnerable code path fails to properly validate buffer boundaries during this parsing operation, allowing an attacker-controlled input to force a read operation beyond the allocated buffer. While this specific vulnerability results in a denial of service rather than information disclosure, out-of-bounds read vulnerabilities can sometimes expose sensitive memory contents or be chained with other vulnerabilities for more severe exploitation.

The network attack vector indicates that this vulnerability can be exploited remotely, for instance by tricking a user into opening a malicious GSF file from a web source or by targeting services that automatically process uploaded media files.

Root Cause

The root cause of CVE-2025-70308 lies in insufficient bounds checking within the GSF demuxer filter parsing logic. When handling GSF container data, the demuxer fails to validate that read operations remain within the boundaries of the allocated buffer. This occurs when processing certain fields or structures within the GSF file format, where attacker-controlled size values or offsets can direct the parser to read beyond legitimate buffer boundaries.

Attack Vector

The attack vector for this vulnerability involves supplying a specially crafted .gsf file to a GPAC-based application or service. Exploitation scenarios include:

1. Direct file processing: Convincing a user to open a malicious GSF file with GPAC or GPAC-based multimedia applications
2. Automated processing pipelines: Targeting media processing services that accept and process GSF files from untrusted sources
3. Web-based exploitation: Hosting malicious GSF files on attacker-controlled servers and tricking users into accessing them

The vulnerability does not require authentication or user interaction beyond file access, making it relatively straightforward to exploit. A proof-of-concept demonstrating this vulnerability is available in the GPAC GSF PoC repository.

Detection Methods for CVE-2025-70308

Indicators of Compromise

• Unexpected crashes or termination of GPAC processes or applications using GPAC libraries
• Memory access violation errors in system logs associated with GPAC GSF demuxer operations
• Presence of malformed or suspicious .gsf files in upload directories or processing queues

Detection Strategies

• Monitor for GPAC process crashes with memory access violation signatures, particularly when processing GSF files
• Implement file format validation for GSF files before processing to detect malformed structures
• Deploy memory protection mechanisms such as ASLR and stack canaries to detect exploitation attempts
• Use application-level logging to track GSF file processing activities and identify anomalous patterns

Monitoring Recommendations

• Configure crash reporting and monitoring for all GPAC-dependent applications and services
• Implement input validation checks for media files before they enter processing pipelines
• Monitor file upload endpoints for unusual volumes of GSF file submissions
• Set up alerting for repeated GPAC process failures that may indicate exploitation attempts

How to Mitigate CVE-2025-70308

Immediate Actions Required

• Upgrade GPAC to a patched version that addresses CVE-2025-70308 when available from the vendor
• Restrict processing of GSF files from untrusted sources until a patch is applied
• Implement network segmentation to isolate media processing services from critical infrastructure
• Review and audit any services that automatically process uploaded media files

Patch Information

Organizations should monitor the official GPAC project for security updates addressing this vulnerability. Technical details about the vulnerability are available in the GPAC GSF PoC repository, which may assist in understanding the specific code paths affected.

Workarounds

• Disable GSF file processing if not required for business operations until a patch is available
• Implement strict input validation to reject GSF files that exceed expected size parameters or contain anomalous structures
• Use application sandboxing to contain potential crashes and prevent impact on other services
• Deploy process monitoring to automatically restart crashed services while limiting exploitation impact