The DoResolveRelativeHost function in url/url_canon_relative.cc in Google Chrome before 30.0.1599.66 allows remote attackers to cause a denial of service (out-of-bounds read) via a relative URL containing a hostname, as demonstrated by a protocol-relative URL beginning with a //www.google.com/ substring.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.