CVE-2025-70968: FreeImage Use After Free Vulnerability

CVE-2025-70968 Overview

CVE-2025-70968 is a Use After Free vulnerability in FreeImage 3.18.0, specifically located in the PluginTARGA.cpp file within the loadRLE() function. This memory corruption flaw occurs when the application accesses previously freed memory during the processing of TGA image files using Run-Length Encoding (RLE) compression. Successful exploitation could allow attackers to execute arbitrary code or cause denial of service conditions by crafting malicious TGA image files.

Critical Impact

This Use After Free vulnerability in FreeImage's TGA image processing could enable remote attackers to achieve code execution or cause application crashes through specially crafted image files.

Affected Products

• FreeImage 3.18.0
• Applications and libraries that integrate FreeImage for image processing
• Systems processing untrusted TGA image files with RLE compression

Discovery Timeline

• 2026-01-14 - CVE CVE-2025-70968 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-70968

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption issue where the application references memory after it has been deallocated. In the context of FreeImage's TGA plugin, the loadRLE() function in PluginTARGA.cpp fails to properly manage memory during the decompression of Run-Length Encoded image data. When processing malformed or specially crafted TGA files, the function may continue to access memory regions that have already been freed, leading to undefined behavior.

The network attack vector indicates that exploitation can occur remotely when a victim application processes a malicious TGA file received over a network, such as through web applications, email attachments, or file sharing services. No authentication or user interaction is required for exploitation, making this vulnerability particularly dangerous in automated image processing pipelines.

Root Cause

The root cause lies in improper memory lifecycle management within the loadRLE() function of the FreeImage TGA plugin. During RLE decompression, memory buffers are allocated to store intermediate image data. Under specific conditions—likely involving malformed RLE packet sequences or unexpected file termination—the code path frees these buffers prematurely while retaining pointers that are subsequently dereferenced. This dangling pointer access constitutes the Use After Free condition.

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious TGA image file with specially constructed RLE-encoded data designed to trigger the vulnerable code path in loadRLE(). When a vulnerable application attempts to load and process this image using FreeImage 3.18.0, the Use After Free condition is triggered. Depending on the application's memory layout and the attacker's ability to control the freed memory contents, this could result in:

1. Arbitrary code execution - If the attacker can spray the heap to control the contents of the freed memory region
2. Information disclosure - Reading sensitive data from reallocated memory
3. Denial of service - Application crash due to invalid memory access

The vulnerability can be triggered through any interface that processes TGA images via FreeImage, including web image upload features, document processors, or image conversion utilities.

A proof-of-concept demonstrating the crash condition is available in the GitHub PoC Repository.

Detection Methods for CVE-2025-70968

Indicators of Compromise

• Unexpected crashes in applications using FreeImage when processing TGA files
• Memory access violations or segmentation faults during image loading operations
• Abnormal TGA files with malformed RLE packet structures in upload directories
• Core dumps indicating heap corruption in FreeImage-linked processes

Detection Strategies

• Monitor application logs for crashes related to TGA file processing or FreeImage library calls
• Implement file integrity monitoring for unexpected TGA files in sensitive directories
• Deploy memory protection tools (ASan, Valgrind) in development/staging environments to detect Use After Free conditions
• Use static analysis tools to identify applications linked against vulnerable FreeImage 3.18.0 versions

Monitoring Recommendations

• Configure endpoint detection to alert on unusual memory access patterns in image processing applications
• Implement input validation and sandboxing for image processing workflows handling untrusted files
• Monitor network traffic for suspicious TGA file transfers, particularly those with unusual RLE encoding patterns
• Enable crash reporting and aggregate analysis across systems using FreeImage for early detection of exploitation attempts

How to Mitigate CVE-2025-70968

Immediate Actions Required

• Audit systems and applications to identify deployments using FreeImage 3.18.0
• Restrict or disable TGA file processing in affected applications where feasible
• Implement input validation to reject malformed TGA files before they reach FreeImage
• Deploy web application firewalls with rules to inspect uploaded image files
• Consider sandboxing image processing operations to limit exploitation impact

Patch Information

At the time of publication, no official patch has been released by the FreeImage project. Organizations should monitor the FreeImage project and relevant security advisories for updates. A proof-of-concept crash is documented in the GitHub PoC Repository, which may provide additional technical context.

Workarounds

• Disable TGA file format support in FreeImage by removing or disabling the TARGA plugin if not required
• Pre-process TGA files through a separate validation layer before passing to FreeImage
• Use alternative image processing libraries that are not affected by this vulnerability
• Implement strict Content-Type validation and reject TGA files from untrusted sources
• Run FreeImage-dependent applications in isolated containers or sandboxed environments to limit blast radius

# Example: Restrict TGA processing permissions (Linux)
# Limit application's ability to read TGA files from untrusted locations
chmod 000 /path/to/untrusted/uploads/*.tga

# Run image processing in a restricted sandbox
firejail --private --net=none /path/to/image-processing-app