yaml-cpp is a YAML parser and emitter in C++.
The function Scanner::peek in scanner.cpp may have an assertion failure.
An attacker could cause a possible Denial of Service condition.
There is no known workaround at this time.
All yaml-cpp users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-cpp/yaml-cpp-0.6.3-r2"