bytedeco/javacpp

dll hijeck

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#818 opened on Sep 8, 2025

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 (0 comments) (0 reactions) (0 assignees)Java (4,279 stars) (620 forks)batch import
enhancementhelp wanted

Description

Loader.java has a DLL hijacking risk at line 1832. When creating an FFmpegFrameGrabber object in ffmpeg within bytedec/javacv, it tries to load non-existent classes (avutil.class, swresample.class, avcodec.class, avformat.class, swscale.class, avdevice.class), resulting in a "dll not found" error.

Contributor guide

Tech stack
javacpp
Domain
security
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of JNIJavaCV basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Examine the Loader.java file at line 1832 (or nearby) to understand the class loading mechanism for native libraries. The issue may involve improper validation of library paths or class names. Look for the specific code that tries to load classes like avutil.class and ensure proper error handling or path sanitization is in place. Also, review the FFmpegFrameGrabber initialization to see where these classes are referenced.