have
The boat had a small leak.

develop, spring
The pipe has sprung a leak.

plug, stop
I managed to plug the leak.

leak in
a leak in the roof

major, serious
minor, small
slow
air, fuel, gas, oil, radiation, water
plumbing (AmE)

cause
The dismantling of a nuclear reprocessing plant caused a leak of radioactivity yesterday.

detect, discover, find, locate, notice
Fortunately, we discovered the leak in time.

fix, repair, stop
The plumber fixed the leak.

prevent
steps that can be taken to prevent gas leaks in the future

happen, occur
come from sth
If you have no idea where the gas leak is coming from, it is always best to turn the complete system off.

leak from
Pollution inspectors were called to a leak from a chemical factory.

leak of
a leak of dangerous chemicals

security
serious
serious leaks of US intelligence

alleged
an alleged leak of a CIA employee's name to the media

come from sth
The leak could only have come from one source.

leak about
a security leak about a number of suspicious deaths among civil servants

leak from
a leak from the prime minister's office

leak of
a leak of confidential material

leak to
a leak to the American authorities

the source of a leak
The organization's press secretary is thought to be the source of the leak.

badly
The house was old and the roof leaked badly.

slightly

carefully, deliberately
widely
The document had been widely leaked.

allegedly
illegally

from
confidential information that has been leaked from the BBC

to
The report was leaked to the press.

Leak is used with these nouns as the subject:
faucet, pipe, radiation, radiator, roof, tap, word

Leak is used with these nouns as the object:
document, identity, information, memo, news, report