The French government says sources in Saudi Arabia think a terrorist attack is potentially imminent in Europe, most probably in France.
The warning is said to have been prompted by increased activity in and around the al Qaeda organisation in the Arabian Peninsula.
French Interior Minister Brice Hortefeux revealed details of the intelligence during the course of a radio interview.
He has been criticised by the opposition for disclosing details of several similar but unspecified warnings at the end of September.
Some say it is a tactic of political diversion.
Nonetheless, France remains on its second-highest level of alert.
Hortefeux said, on average, two terrorist plots were thwarted each year in the country, and 61 people are in prison for terrorism-related offences.