CVE-2025-48798: GIMP Use-After-Free Vulnerability

CVE-2025-48798 Overview

A use-after-free vulnerability has been identified in GIMP when processing XCF image files. This flaw allows an attacker to craft malicious XCF image files that, when opened by a user, can trigger memory corruption within GIMP. The vulnerability exploits improper memory management during XCF file parsing, leading to application crashes and potentially enabling arbitrary code execution with the privileges of the user running GIMP.

Critical Impact

Opening a maliciously crafted XCF image file can trigger use-after-free memory corruption, potentially leading to application crashes, denial of service, or arbitrary code execution in the context of the user running GIMP.

Affected Products

• GIMP (GNU Image Manipulation Program)
• Red Hat Enterprise Linux distributions with GIMP packages
• Debian-based Linux distributions with GIMP packages

Discovery Timeline

• May 27, 2025 - CVE-2025-48798 published to NVD
• November 3, 2025 - Last updated in NVD database

Technical Details for CVE-2025-48798

Vulnerability Analysis

This vulnerability falls under CWE-416 (Use After Free), a critical memory corruption class where a program continues to use a pointer after the memory it references has been freed. In the context of GIMP's XCF file processing, the application improperly manages memory objects during the parsing of XCF image data structures. When processing a specially crafted XCF file, GIMP may free a memory region while still maintaining a reference to it. Subsequent operations that access this freed memory can lead to unpredictable behavior.

The local attack vector requires user interaction—specifically, a victim must open the malicious XCF file. However, the ease of social engineering attacks (e.g., sharing malicious images via email or websites) makes this a viable attack surface for targeted exploitation.

Root Cause

The root cause lies in GIMP's XCF file parser, which fails to properly track the lifecycle of memory objects during complex image processing operations. When parsing certain XCF structures, the parser may deallocate memory that is still referenced elsewhere in the processing pipeline. This creates a dangling pointer condition where subsequent read or write operations reference memory that has already been returned to the heap, resulting in use-after-free behavior that can corrupt adjacent memory structures or crash the application.

Attack Vector

The attack requires local access and user interaction. An attacker must convince a victim to open a specially crafted XCF file using GIMP. This can be accomplished through various social engineering techniques:

1. Email attachments: Sending malicious XCF files disguised as legitimate image projects
2. Website downloads: Hosting malicious XCF files on compromised or attacker-controlled websites
3. File sharing: Distributing malicious files through collaborative platforms or project-sharing services

Once the victim opens the malicious file, the use-after-free condition is triggered during the XCF parsing phase, potentially allowing an attacker to achieve code execution with the same privileges as the GIMP process. For detailed technical analysis, refer to the GitLab GIMP Issue #11822.

Detection Methods for CVE-2025-48798

Indicators of Compromise

• Unexpected GIMP crashes when opening XCF files, particularly from untrusted sources
• Memory corruption errors or segmentation faults in GIMP-related system logs
• Suspicious XCF files with unusual file structures or malformed headers
• Unusual process behavior or child processes spawned by GIMP after opening specific files

Detection Strategies

• Monitor for abnormal GIMP process terminations, especially those involving memory-related exit codes (SIGSEGV, SIGBUS)
• Implement file integrity monitoring for XCF files entering the network, flagging those with anomalous characteristics
• Use endpoint detection and response (EDR) solutions to identify suspicious memory access patterns in GIMP processes
• Enable application crash reporting and analyze crash dumps for signs of heap corruption or use-after-free patterns

Monitoring Recommendations

• Configure SentinelOne's behavioral AI to detect anomalous process behavior following GIMP file operations
• Implement file type filtering at email gateways to quarantine or scan XCF attachments from external sources
• Deploy network monitoring to identify downloads of XCF files from suspicious domains
• Enable verbose logging for GIMP processes in development and testing environments to capture early signs of exploitation attempts

How to Mitigate CVE-2025-48798

Immediate Actions Required

• Apply security patches from your Linux distribution vendor immediately (see patch information below)
• Avoid opening XCF files from untrusted or unknown sources until patches are applied
• Consider temporarily restricting GIMP usage in environments processing files from external parties
• Implement application sandboxing or containerization for GIMP to limit the impact of potential exploitation

Patch Information

Multiple Linux distributions have released security advisories and patches addressing CVE-2025-48798:

Red Hat Enterprise Linux:

• RHSA-2025:9162
• RHSA-2025:9165
• RHSA-2025:9308
• RHSA-2025:9309
• RHSA-2025:9310
• RHSA-2025:9314
• RHSA-2025:9315
• RHSA-2025:9316
• RHSA-2025:9501
• RHSA-2025:9569

Debian:

• Debian LTS Announcement

For additional technical details, refer to Red Hat Bugzilla #2368557 and the Red Hat CVE-2025-48798 page.

Workarounds

• Disable or restrict access to GIMP on systems that process files from untrusted sources
• Convert XCF files to safer formats (PNG, JPEG) using alternative tools before opening in GIMP
• Run GIMP within isolated environments such as virtual machines or containers (e.g., Flatpak, Snap) to limit potential damage from exploitation
• Implement strict file type policies at organizational boundaries to filter or quarantine XCF files pending security review

# Update GIMP on Red Hat/CentOS/Fedora systems
sudo dnf update gimp

# Update GIMP on Debian/Ubuntu systems
sudo apt update && sudo apt upgrade gimp

# Run GIMP in Flatpak sandbox (if installed via Flatpak)
flatpak run org.gimp.GIMP