RUSTSEC-2018-0006: Uncontrolled recursion leads to abort in deserialization

[github-actions]

Uncontrolled recursion leads to abort in deserialization

Details
Package	yaml-rust
Version	0.3.5
URL	chyh1990/yaml-rust#109
Date	2018-09-17
Patched versions	>=0.4.1

Affected versions of this crate did not prevent deep recursion while
deserializing data structures.

This allows an attacker to make a YAML file with deeply nested structures
that causes an abort while deserializing it.

The flaw was corrected by checking the recursion depth.

Note: clap 2.33 is not affected by this because it uses yaml-rust
in a way that doesn't trigger the vulnerability. More specifically:

1. The input to the YAML parser is always trusted - is included at compile
   time via include_str!.

2. The nesting level is never deep enough to trigger the overflow in practice
   (at most 5).

See advisory page for additional details.