A recently announced SHA-1 collision attack has the potential to break code repositories that use the Subversion (SVN) revision control system. The first victim was the repository for the WebKit browser engine that was corrupted after someone committed two different PDF files with the same SHA-1 hash to it.

The incident happened hours after researchers from Google and Centrum Wiskunde & Informatica (CWI) in the Netherlands announced the first practical collision attack against the SHA-1 hash function on Thursday. Their demonstration consisted of creating two PDF files with different contents that had the same SHA-1 digest.

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SHA-1 collision can break SVN code repositories