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configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking #146333

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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errortype-securityA security issue
@StanFromIreland

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@StanFromIreland

Bug report

Bug description:

Found by OSS Fuzz in#461069020.

The below reproducer:

importconfigparserimporttimeforNin (10000,20000,30000,40000):cfg= ("[section]"+"\n"+"x"+" "*N+"y"+"\n"    )parser=configparser.RawConfigParser()s=time.perf_counter()try:parser.read_string(cfg)except:passt=time.perf_counter()-sprint(f"{N}{t}")

reveals the quadratic behaviour:

10000  0.547869257017737320000  2.17552005700417830000  4.9720419189834540000  8.673784376995172

CPython versions tested on:

CPython main branch

Operating systems tested on:

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    stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errortype-securityA security issue

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