CVE-2025-14425: GIMP JP2 File Parsing RCE Vulnerability

CVE-2025-14425 Overview

CVE-2025-14425 is a heap-based buffer overflow vulnerability in the GNU Image Manipulation Program (GIMP) that affects the parsing of JPEG 2000 (JP2) image files. The flaw allows attackers to execute arbitrary code in the context of the current user when a victim opens a crafted JP2 file. The vulnerability was reported through the Zero Day Initiative as ZDI-CAN-28248 and disclosed publicly as ZDI-25-1139. Categorized as [CWE-122] Heap-based Buffer Overflow, the issue impacts GIMP version 3.0.6. Exploitation requires user interaction, but no authentication is needed.

Critical Impact
Successful exploitation results in arbitrary code execution within the security context of the user running GIMP, enabling attackers to install software, view, change, or delete data, or create new accounts with full user rights.

Affected Products

GIMP 3.0.6
Systems with GIMP installed that process untrusted JP2 files
Windows, macOS, and Linux distributions bundling the affected GIMP release

Discovery Timeline

2025-12-23 - CVE-2025-14425 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-14425

Vulnerability Analysis

The vulnerability resides in GIMP's JP2 file parser. GIMP fails to validate the length of user-supplied data before copying it into a fixed-size heap buffer. When a specially crafted JP2 file is parsed, the copy operation writes past the allocated buffer boundary, corrupting adjacent heap memory. Attackers can shape the overflow to overwrite function pointers, object metadata, or other heap-resident control structures. This yields reliable arbitrary code execution in the process context of GIMP. Because GIMP typically runs as the interactive desktop user, exploitation grants attackers the same permissions as the victim. The bug maps to [CWE-122] Heap-based Buffer Overflow, a memory corruption class historically favored for reliable client-side exploitation.

Root Cause

The defect stems from missing bounds validation in the JP2 parsing routine prior to a memory copy into a heap-allocated buffer. The parser trusts length fields extracted from the file structure without ensuring they fit the destination allocation. This design gap enables attacker-controlled write primitives during image decoding.

Attack Vector

Exploitation requires the victim to open a malicious JP2 file or visit a web page that delivers one. Attackers can distribute the crafted file through phishing emails, chat attachments, watering-hole websites, or asset repositories used by design and creative teams. No network privileges or credentials are required to trigger the vulnerable code path.

// No verified proof-of-concept code is publicly available.
// The vulnerability is triggered when GIMP parses attacker-controlled
// length fields inside a JP2 file and copies data into a heap buffer
// without validating the copy size against the allocation size.
// See the ZDI advisory ZDI-25-1139 for advisory-level technical details.

Detection Methods for CVE-2025-14425

Indicators of Compromise

Unexpected GIMP crashes or SIGSEGV events immediately after opening a .jp2 or .jpx file
GIMP spawning child processes such as shells, script interpreters, or network utilities during or after image loads
Outbound network connections initiated by the gimp process to unfamiliar hosts
New persistence artifacts (autoruns, cron entries, user-level services) created shortly after JP2 file activity

Detection Strategies

Monitor for anomalous process ancestry where gimp or gimp-console is the parent of command interpreters or LOLBins
Alert on file write activity to user startup directories originating from the GIMP process
Inspect email and web gateways for JP2 attachments and downloads from untrusted sources
Correlate crash telemetry from endpoints against the GIMP version 3.0.6 inventory

Monitoring Recommendations

Track installed GIMP versions across the fleet and flag hosts running vulnerable builds
Log JP2 file handling events at endpoints where creative applications are permitted
Retain memory dumps from GIMP crashes for post-incident analysis of exploitation attempts

How to Mitigate CVE-2025-14425

Immediate Actions Required

Upgrade GIMP to a fixed release once distributed by the GIMP project or your OS vendor
Instruct users to avoid opening JP2 files from untrusted email, chat, or web sources
Remove or restrict GIMP on systems that do not require image editing functionality
Apply the upstream fix committed in the GIMP repository to any locally built packages

Patch Information

The GIMP project has committed a fix in commit cd1c88a0364ad1444c06536731972a99bd8643fd in the official GNOME GitLab repository. Refer to the GIMP upstream commit and the Zero Day Initiative Advisory ZDI-25-1139 for authoritative remediation details. Rebuild and redistribute GIMP packages that incorporate this commit, or wait for updated binaries from your distribution maintainer.

Workarounds

Block or quarantine .jp2 and .jpx attachments at email and web gateways until patched
Configure the desktop environment to open JP2 files with a hardened, sandboxed viewer instead of GIMP
Run GIMP inside a sandbox such as bubblewrap, firejail, or a Flatpak container to constrain post-exploitation impact
Apply application allow-listing to prevent GIMP from launching unexpected child processes

bash

# Example: launch GIMP inside a restrictive Firejail sandbox on Linux
firejail --private --net=none --noroot --caps.drop=all gimp

# Example: verify the installed GIMP version to confirm exposure
gimp --version