TMZ reports former Subway spokesman Jared Fogle was assaulted in prison in late January.
The website reports Fogle's attacker is a fellow inmate named Steven Nigg.
TMZ reports Nigg started punching Fogle in the recreation yard at the Englewood federal prison in Littleton, Colorado.
Fogle ended up with a bloody nose and swollen face.
Nigg was sent to solitary confinement as a punishment.
Fogle was sentenced to more than 15 years in prison in November after his conviction of possessing child pornography and crossing state lines to pay for sex with underage prostitutes.
Nigg's family told TMZ Nigg is angry because so many child sex predators are housed at the low-security prison, and Fogle was the final straw for him.
Fogle's attorney had no comment on the alleged attack.
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Jared Fogle, ex-Subway pitchman, assaulted in prison, report says
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