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Fix fuzzer metadata injection via unicode line separator abuse #5429

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Fix fuzzer metadata injection via unicode line separator abuse #5429

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2bbcbb0
Fix metadata injection via decode_to_unicode errors='ignore'
JM00NJ Aug 15, 2026
2392e3e
Fix metadata injection via splitlines() line separator abuse
JM00NJ Aug 15, 2026
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2 changes: 1 addition & 1 deletion src/clusterfuzz/_internal/base/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ def decode_to_unicode(obj):
if not hasattr(obj, 'decode'):
return obj

return obj.decode('utf-8', errors='ignore')
return obj.decode('utf-8', errors='replace')


def encode_as_unicode(obj):
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3 changes: 3 additions & 0 deletions src/clusterfuzz/_internal/bot/tasks/utasks/fuzz_task.py
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Expand Up @@ -760,6 +760,9 @@ def add_additional_testcase_run_data(testcase_run, fully_qualified_fuzzer_name,
def get_fuzzer_metadata_from_output(fuzzer_output):
"""Extract metadata from fuzzer output."""
metadata = {}
fuzzer_output = fuzzer_output.replace(
'\r', '').replace('\x85', '').replace(
'\u2028', '').replace('\u2029', '')
for line in fuzzer_output.splitlines():
match = FUZZER_METADATA_REGEX.match(line)
if match:
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