A network exec, speaking under terms of anonymity, told The AP on Sunday that the CBS Evening News anchor has chosen not to renew her contract, which is to expire in June.
It is thought that Couric's decision to leave CBS is motivated by an interest in launching her own syndicated talkshow next year.
In an official statement, CBS spokeswoman Sonya McNair insisted that the network is not yet willing to comment on the news anchor's future.
"We're having ongoing discussions with Katie Couric," McNair said. "We have no announcements to make at this time. Until we do, we will continue to decline comment on rumour or speculation."
The journalist's own spokesman Matthew Hiltzik also refused to comment on Couric's career plans.
Couric made headlines in 2006 by leaving her job as co-host of NBC's Today Show to become the first solo female anchor of a network evening newscast when she signed for a five-year deal with CBS.
Among the most memorable moments of her tenure as anchor of the CBS Evening News were her combative interview with Vice Presidential candidate Sarah Palin during the 2008 election campaign and former Senator John Edwards's appearance after announcing that his wife Elizabeth had been diagnosed with a reoccurrence of cancer that would later take her life.
Earlier this year, Couric inked a deal to pen an advice book titled The Best Advice I Ever Got: Lessons From Extraordinary Lives.
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Watch Katie Couric's 2008 interview with former Alaska Governor Sarah Palin below: