CVE-2025-70302: GPAC Heap Overflow DoS Vulnerability

CVE-2025-70302 Overview

A heap overflow vulnerability has been identified in the ghi_dmx_declare_opid_bin() function of GPAC v2.4.0. This memory corruption flaw allows attackers to cause a Denial of Service (DoS) condition by supplying specially crafted input to the affected component. GPAC is a widely-used open-source multimedia framework for processing, packaging, and streaming audio-video content.

Critical Impact

Successful exploitation of this heap overflow vulnerability can crash the GPAC application, resulting in denial of service conditions that disrupt multimedia processing operations.

Affected Products

• GPAC v2.4.0
• GPAC multimedia framework installations using the affected ghi_dmx_declare_opid_bin() function
• Systems processing untrusted multimedia content through GPAC

Discovery Timeline

• 2026-01-15 - CVE-2025-70302 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-70302

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption flaw that occurs when a program writes data beyond the allocated boundaries of a heap buffer. In the context of the ghi_dmx_declare_opid_bin() function within GPAC, improper bounds checking during the processing of input data allows an attacker to trigger a heap overflow condition.

The vulnerability requires local access and user interaction, meaning an attacker would need to convince a user to open a maliciously crafted file or provide crafted input to the GPAC application. While the flaw does not result in direct information disclosure or data integrity compromise, it can reliably crash the application, causing service disruption.

Root Cause

The root cause lies in insufficient input validation within the ghi_dmx_declare_opid_bin() function. When processing certain input structures, the function fails to properly validate the size of incoming data against the allocated heap buffer, allowing writes beyond the intended memory boundaries. This heap-based buffer overflow (CWE-122) represents a classic memory safety issue common in C/C++ codebases.

Attack Vector

The attack vector is local, requiring the attacker to provide a crafted input file or data stream to the GPAC application. The exploitation scenario typically involves:

1. An attacker crafts a malicious multimedia file or input stream designed to trigger the overflow
2. The victim opens or processes the malicious file using GPAC
3. The ghi_dmx_declare_opid_bin() function processes the crafted input without proper bounds validation
4. Memory corruption occurs on the heap, leading to application crash

Technical details regarding the specific exploitation mechanism can be found in the publicly available proof-of-concept documentation.

Detection Methods for CVE-2025-70302

Indicators of Compromise

• Unexpected GPAC application crashes during multimedia file processing
• Core dumps or crash logs showing heap corruption in ghi_dmx_declare_opid_bin()
• Suspicious multimedia files with abnormal structure or metadata in input directories
• Repeated crash events when processing files from untrusted sources

Detection Strategies

• Monitor GPAC processes for abnormal termination signals (SIGSEGV, SIGABRT)
• Implement file integrity monitoring on GPAC configuration and binary files
• Deploy memory protection tools such as AddressSanitizer during development and testing
• Configure crash reporting to capture and analyze heap overflow events

Monitoring Recommendations

• Enable verbose logging in GPAC to track file processing operations
• Set up automated alerting for repeated application crashes
• Monitor system memory usage patterns for anomalies during GPAC operations
• Review input files from external sources before processing with GPAC

How to Mitigate CVE-2025-70302

Immediate Actions Required

• Update GPAC to a patched version when available from the upstream project
• Restrict processing of untrusted or unknown multimedia files through GPAC
• Implement input validation layers before passing files to GPAC for processing
• Consider running GPAC in a sandboxed environment to limit crash impact

Patch Information

As of the last NVD update on 2026-01-16, users should monitor the official GPAC project repository and release channels for security patches addressing this heap overflow vulnerability. The proof-of-concept repository may contain additional technical context regarding the vulnerability.

Workarounds

• Avoid processing multimedia files from untrusted or unknown sources
• Run GPAC in a containerized or sandboxed environment to isolate potential crashes
• Implement file type and structure validation before processing with GPAC
• Consider using alternative multimedia processing tools until a patch is available

# Example: Running GPAC in a restricted environment with resource limits
# Set memory limits to contain potential overflow effects
ulimit -v 1048576
# Run GPAC with minimal privileges
sudo -u gpac-user gpac -strict-error input_file.mp4