Around 15,000 people have travelled to fight alongside Islamic State (IS) and other hardcore militant groups from "countries that have not previously faced challenges relating to al-Qaeda," said the report.
The number of foreign jihadists travelling to fight since 2010 exceeds the cumulative total of the 20 preceding years "many times", the Security Council study said.
"There are instances of foreign terrorist fighters from France, the Russian Federation and the United Kingdom of Great Britain and Northern Ireland operating together," it said, according to the Guardian.
Dozens have been arrested for preparing to leave to join the IS group or helping others to do so.
France is also moving closer to adopting an "anti-terrorism" law which would slap a travel ban on anyone suspected of planning to wage jihad.
The UN warned that more nations than ever face the problem of dealing with fighters returning from the battle zone.
A US security official estimated that there were close to 2,000 westerners among the 15,000 foreign fighters.
Previous figures showed there were 7,000 foreign jihadists fighting in March and 12,000 in July suggesting 1,000 a month were travelling to fight, despite the launch of US air strikes three months ago, although there is a lag of a few weeks in the figures.
The report was produced by a committee that monitors al-Qaeda, and concluded that the once mighty and feared group was now "manoeuvring for relevance" following the rise of the even more militant IS, which was booted out of al-Qaeda by leader Ayman al-Zawahiri.
"Al-Qaeda core and Isil (IS) pursue similar strategic goals, albeit with tactical differences regarding sequencing and substantive differences about personal leadership," the UN wrote.
Obama has vowed he will not order a large force into combat in Iraq or Syria, relying instead on air power and local forces.
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