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Add test for CVE-2021-25292 ReDoS #5393

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merged 1 commit into from Apr 9, 2021
Merged

Add test for CVE-2021-25292 ReDoS #5393

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10 changes: 10 additions & 0 deletions Tests/test_file_pdf.py
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Expand Up @@ -286,3 +286,13 @@ def test_pdf_append_to_bytesio():
f = io.BytesIO(f.getvalue())
im.save(f, format="PDF", append=True)
assert len(f.getvalue()) > initial_size


@pytest.mark.timeout(1)
def test_redos():
malicious = b" trailer<<>>" + b"\n" * 3456

# This particular exception isn't relevant here.
# The important thing is it doesn't timeout, cause a ReDoS (CVE-2021-25292).
with pytest.raises(PdfParser.PdfFormatError):
PdfParser.PdfParser(buf=malicious)