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NuPhoto / Getty Images

Source code used by Apple to securely boot iPhones leaked online and was widely distributed until Thursday morning, when Apple used copyright law to get the code taken down. Newer iPhone models have additional security measures that will likely mitigate any security problems.

Why it matters: The source code gives malicious actors an unprecedented look at the internals of one of iPhone's key security features. But even if attackers could use the code to discover vulnerabilities in iOS 9, that does not mean most iPhone users are currently at risk.

How it works: The code, posted to the programming repository GitHub and first spotted by reporters at Motherboard, controls the iBoot function in iOS 9. iBoot checks to make sure the operating system is authentic before booting the phone.

iOS 9 isn't the current iOS, but it also isn't nothing: iOS is currently at version 11, meaning the code is likely out of date. And nearly all phones in the Touch ID era include a "secure enclave" processor — a processor that makes it much more difficult to tamper with the boot process.

Still, for legacy phones or by potentially pairing the leaked code with future vulnerabilities in boot security, it may provide some additional security risk.

Go deeper

Ro Khanna accuses Biden of quitting Middle East

Rep. Ro Khanna. Photo: Cody Glenn/Sportsfile for Web Summit via Getty Images

An outspoken progressive Democrat is wary of President Biden’s approach to the Middle East, arguing it’s like “conceding defeat of the aspiration” to win a Nobel Peace Prize.

Why it matters: A number of members of Biden’s own party dislike his Middle East strategy, as his administration signals the region is no longer the priority it was for President Obama and his predecessors.

Democrats eye reconciliation for immigration

Photo: Chip Somodevilla/Getty Images

Comprehensive immigration reform is a pipe dream, but some Senate Democrats are hoping to tie key immigration provisions to the next big reconciliation push.

Why it matters: Immigration is one of the most controversial and partisan issues in U.S. politics, which is why the budget reconciliation process — which allows for bills to pass the Senate with a simple majority rather than the usual 60 votes — is so attractive.

11 mins ago - Politics & Policy

Scoop: Biden meeting Quad amid own pivot toward Asia

Artists paint portraits of President Biden and Vice President Kamala Harris in Mumbai, India. Photo: Anshuman Poyrekar/Hindustan Times via Getty Images

President Biden plans to meet this month with the leaders of Japan, Australia and India in a virtual summit of the so-called Quad, according to people familiar with the matter.

Why it matters: By putting a Quad meeting on the president’s schedule, the White House is signaling the importance of partnerships and alliances to counter China’s growing influence in the Indo-Pacific region.