Yes, the fairies in Sleeping Beauty can lie.
Maleficent claimed to bear no ill will.
Maleficent, the evil fairy in Disney’s Sleeping Beauty, claims she was not offended and bears no ill will at not being invited to the princess’s christening - but she was indeed offended and she does indeed bear ill will towards them.
Queen: And you're not offended, Your Excellency?
Maleficent: Why, no, Your Majesty. And to show I bear no ill will, I, too, shall bestow a gift on the child. Listen well, all of you! The princess shall indeed grow in grace and beauty, beloved by all who know her. But… before the sun sets on her sixteenth birthday, she shall prick her finger on the spindle of a spinning wheel...and DIE!
- Sleeping Beauty (1959)
After saying she was not offended and does not bear ill will, Maleficent cursed the princess as her revenge - so she was indeed offended and did bear ill will due to this slight.
The three fairies say they need berries.
Also in Disney’s Sleeping Beauty, Flora, Fauna, and Merryweather all lie to Aurora by telling her they need her to pick some berries.
Briar Rose:
Well, and what are you three dears up to?
Merryweather:
Up to?
Fauna:
Up to?
Flora:
Up to?
Flora:
Eh, eh, eh, we, we, well, we, we ...
Merryweather:
Want you to pick some berries.
Flora:
That's it, berries!
Briar Rose:
Berries?
Fauna:
Lots of berries.
Briar Rose:
But I picked berries yesterday.
Flora:
Oh, we need more, dear.
Fauna:
Lots, lots more.
- Sleeping Beauty (1959)
All three of the fairies lie - they did not need berries, they just wanted to get Aurora out of the cottage so they could prepare surprises for her sixteenth birthday.