The world wide web massive said it showed up outside of a 2014 violation exposed in Sept, when Search engines exposed 500 thousand records had been utilized.
Yahoo said titles, contact figures, security passwords and contact information were thieved, but not financial institution and transaction information.
The organization, which is being taken over by Verizon, said it was working carefully with the cops and regulators.
Yahoo said it "believes an unexpected 3rd celebration, in Aug 2013, took information associated with more than one billion dollars customer accounts".
The violation "is likely unique from the occurrence the organization exposed on Sept 22, 2016".
However, the three-year-old crack was discovered as part of ongoing research by regulators and protection professionals into the 2014 violation, Search engines said.
Account customers were advised to change their security passwords and protection concerns.
The California-based organization has more than a billion dollars per month effective customers, although many people have several records. There are also many records that are little used or inactive.
Vulnerability
Cyber protection professional Troy Search informed the BBC: "This would be far and away the greatest information violation we've ever seen. In fact, the 500 thousand they exposed a couple of several weeks ago would have been, and to see that number now dual is unmatched."
Yahoo said some of the violation could be connected to state-sponsored action, as with the past strike.
Prof Chris Sommer, a professional in electronic 'forensics' at Manchester Town School, informed the BBC he could be convinced it was a state-sponsored crack, "but at when I'm not".
"What on world is situations going to do with one billion dollars records of common users? That's the problems I have," he said.
In Sept, when Search engines exposed the 2014 information violation, the organization said information had been "stolen by what we believe is a state-sponsored actor", but it did not say which nation it attributed.
Yahoo realized of 'state-backed' crack in 2014
Verizon: Search engines information violation may hit deal
Senators requirement solutions over Search engines hack
The newest disclosure increases clean concerns about Verizon's $4.8bn suggested purchase of Search engines, and whether the US cellular service provider will try to alter or give up its bid.
'Pattern of serious failures'
If the hackers cause a customer backlash against Search engines, the organization's services would not be as useful to Verizon.
Marissa MayerImage copyrightGETTY IMAGES
Yahoo us president Marissa Mayer is discussing the selling of Yahoo's primary business to Verizon
Verizon said that it would assess the scenario as Search engines looks into and would evaluation the "new growth before attaining any last conclusions".
Mr Search said that Verizon supposedly cut its assessment of Search engines by $1bn - almost 20% of the unique bid's value - after good information showed up of the 2014 strike.
The newest details "will absolutely effect that assessment even further, not just because of the range of it, but because it reveals a design of serious problems on Yahoo's behalf", he said.
It is a further discomfort to a organization that was once one of the greatest titles of the online but which has did not keep up with increasing celebrities such as Search engines and Facebook or myspace.
Yahoo was once considered to be worth $125bn during the dotcom growth. Various efforts recover its performance didn't work to control its decrease.
Analysis: Lady Lee, Northern The united states technological innovation reporter
Good sadness, can things get any more intense for Yahoo? An extensive catastrophe. Uncomfortable. Negligent?
We've come to agree to that even the best techniques get assaulted by online scammers. But repeatedly? And in such great numbers? Something was seriously, seriously incorrect.
Looking to the upcoming, this is yet more issue for Verizon, which decided to buy Search engines before all of these mishaps were published.
It desired the organization because of its large user-base and marketing achieve. How many of those customers are going to keep around when this kind of thing is going on? What's in it for them?
There's discuss of a rebate on the $4.8bn Verizon decided to pay out. It's a game of how-low-can-you-go in the season, you'd think.
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