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Description
During fuzzing of Python standard libraries, the following code snippet causes anUnboundLocalError with the following message:UnboundLocalError: cannot access local variable 'pos' where it is not associated with a value'. This occurs in the_get_ptext_to_endchars function at line 1035 inemail/_header_value_parser.py.
import email._header_value_parseremail._header_value_parser.parse_message_id("<T@[")Exception Trace
Traceback (most recent call last): File "/usr/lib/python3.12/email/_header_value_parser.py", line 2118, in get_msg_id token, value = get_dot_atom_text(value) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/email/_header_value_parser.py", line 1344, in get_dot_atom_text raise errors.HeaderParseError("expected atom at a start of "email.errors.HeaderParseError: expected atom at a start of dot-atom-text but found '['During handling of the above exception, another exception occurred:Traceback (most recent call last): File "rep.py", line 2, in <module> email._header_value_parser.parse_message_id("<T@[") File "/usr/lib/python3.12/email/_header_value_parser.py", line 2149, in parse_message_id token, value = get_msg_id(value) ^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/email/_header_value_parser.py", line 2121, in get_msg_id token, value = get_no_fold_literal(value) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/email/_header_value_parser.py", line 2066, in get_no_fold_literal token, value = get_dtext(value) ^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/email/_header_value_parser.py", line 1557, in get_dtext ptext, value, had_qp = _get_ptext_to_endchars(value, '[]') ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/email/_header_value_parser.py", line 1033, in _get_ptext_to_endchars pos = pos + 1 ^^^UnboundLocalError: cannot access local variable 'pos' where it is not associated with a valueCPython versions tested on:
3.12, 3.11, 3.10, 3.9
Operating systems tested on:
Linux