CVE-2026-14266 Poc: 7-Zip XZ Heap Buffer Overflow PoC Generator

Proof of Concept generator for reproducing the XZ heap buffer overflow vulnerability in 7-Zip.

The script creates a specially crafted .xz archive designed to reproduce the crash condition in the vulnerable multi-threaded XZ decompression path.

Vulnerability Information

• CVE: CVE-2026-14266
• Type: Heap Buffer Overflow
• Fixed version: 26.02 or later
• Component: XZ Decoder

Features

• Generates a valid .xz archive from scratch
• Reproduces the crash condition on vulnerable versions of 7-Zip
• No external archive generation tools required

Usage

python3 CVE-2026-14266.py

Output

poc-cve-2026-14266-crash.xz