Exploitation Summary
EIP tracks 2 public exploits for CVE-2026-39973. PoCs published by adminlove520, frawlaboy.
AI-analyzed exploit summary This repository contains a functional C# PoC for CVE-2026-39973, a path traversal vulnerability in Apktool 3.0.1. The exploit crafts a malicious `resources.arsc` file to inject arbitrary files into sensitive paths (e.g., `~/.bashrc` or Windows startup folder) by leveraging a security regression in `ResFileDecoder.java`.
Description
Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.
Exploits (2)
This repository contains a functional C# PoC for CVE-2026-39973, a path traversal vulnerability in Apktool 3.0.1. The exploit crafts a malicious `resources.arsc` file to inject arbitrary files into sensitive paths (e.g., `~/.bashrc` or Windows startup folder) by leveraging a security regression in `ResFileDecoder.java`.
This repository contains a functional C# PoC for CVE-2026-39973, a path traversal vulnerability in Apktool 3.0.1. The exploit crafts a malicious `resources.arsc` file to inject path traversal sequences into the type name, allowing arbitrary file writes.
References (4)
Scores
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N