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Re:Tell HN: GitHub will reset passwords June 24, 2020 by jhayward on Monday May 25, 2020 @07:25PM (#23305939)
I don't know what method GH is using, but the standard attack on hashed passwords is the use of rainbow tables[1]

[1] https://en.wikipedia.org/wiki/Rainbow_table

Re:Tell HN: GitHub will reset passwords June 24, 2020 by gus_massa on Monday May 25, 2020 @07:41PM (#23306028)
Most modern hash algorithm like bcrypt or scrypt add automatically a salt to prevent the use of rainbow tables.