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Thank you for your observation, you should note that the Wireshark project does not supply winflexbison, that is an external resource provided by the winflexbison project over at

As you didn't indicate which package you used, I downloaded the latest zip and submitted it, and the 2 executables in it, to VirusTotal which checks the files using 73 different AV engines and 2 engines reported issues with the executables, but 71 didn't, so as Jaap stated, this is likely to be a false positive.