Add advisory for hyperium/http/issues/352

[Qwaz]

HeaderMap::reserve() used usize::next_power_of_two() to calculate the increased capacity. However, next_power_of_two() silently overflows to 0 if given a sufficently large number in release mode.

If the map was not empty when the overflow happens, the library will invoke self.grow(0) and start infinite probing. This allows an attacker who controls the argument to reserve() to cause a potential denial of service (DoS).

The flaw was corrected in 0.2.0 release of http crate.

[kpcyrd]

Any plans to backport this to http 0.1?

[Qwaz]

@kpcyrd The fix is available on v0.1.20, and the affected version range has been updated in this PR.