He is however out of the remainder of this season, and is scheduled to make his playing return in preseason after undergoing rehabilitation for successful knee surgery in Sweden.
Cuthbert boasts an impressive scoring rate of 37 tries in just 79 games for Cardiff Blues after making his debut in the 2011/12 season, as well as 15 tries in 42 appearances for Wales.
And with the news of his signing coming just a day after the Blues also scooped the signatures of Scarlets duo George Earle and Kirby Myhill, head coach Danny Wilson believes his squad for next term is already taking fine shape.
"Alex has played exceptionally well for Cardiff Blues since returning from the Rugby World Cup, and we're excited that he has now committed his future to us," he told Cardiff Blues' official website.
"Alex's attitude has always been excellent in my time at the region and he's a good professional and hard worker, both on and off the field, who always gives his all for the team.
"Alex is undoubtedly a high quality international winger who is determined to improve year on year. We are all delighted that he has now pledged to do that at Cardiff Blues."
Cuthbert added: "I've really enjoyed the environment and culture this season at Cardiff Blues under Danny Wilson and the direction we are all now heading in.
"The players have really bought into the style of rugby we're looking to produce and that has been reflected in the results over the last six months.
"I'm pleased to sign a new contract at Cardiff Blues and looking forward to getting back to full fitness and the start of next season."
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