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Use more specific regex chars to prevent ReDoS

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* CVE-2021-25292
This commit is contained in:
Hugo van Kemenade 2021-01-09 15:53:09 +02:00 committed by Andrew Murray
parent cbdce6c5d0
commit 3bce145966
1 changed files with 2 additions and 1 deletions
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src/PIL/PdfParser.py
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@ -580,8 +580,9 @@ class PdfParser:
whitespace_or_hex = br"[\000\011\012\014\015\0400-9a-fA-F]"
whitespace_optional = whitespace + b"*"
whitespace_mandatory = whitespace + b"+"
whitespace_optional_no_nl = br"[\000\011\014\015\040]*" # no "\012" aka "\n"
newline_only = br"[\r\n]+"
newline = whitespace_optional + newline_only + whitespace_optional
newline = whitespace_optional_no_nl + newline_only + whitespace_optional_no_nl
re_trailer_end = re.compile(
whitespace_mandatory
+ br"trailer"