In July last year, about 17 soldiers were killed and 30 others wounded in an attack on a military base in the central town of Nampala.
The attackers set parts of the camp on fire before taking off.
Mali's President Ibrahim Boubacar Keita has declared three days of national mourning in a tweet following the latest attack.
The fight against extremist groups is one of the major challenges of Mr Keita's government.
But a new report by Human Rights Watch says the Malian government is not doing enough to protect civilians from the jihadists.
Wednesday's attack shows that even soldiers aren't safe, says the BBC World Service Africa editor James Copnall.Published: 2017-01-18 19:18:54