YAML vulnerabilities

In the yaml library on the 1.x branch before 1.10.3 or the 2.x branch before 2.8.3, parsing a YAML document may throw a RangeError due to a stack overflow. The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a RangeError: Maximum call stack size exceeded with a small payload (~2–10 KB). The RangeError is not a YAMLParseError, so applications that only catch YAML-specific errors will encounter an unexpected exception type, which depending on the host application's exception handling can fail requests or terminate the Node.js process.

YAML before version 1.30 for Perl allows a loaded document to trigger the DESTROY method of arbitrary classes. The perl/hash:Class tag blesses a hash into the class it names, and Perl calls DESTROY when it goes out of scope.

YAML before version 1.27_001 for Perl allows a loaded perl/glob document to replace any package variable, which can lead to arbitrary code execution. The document can enable code loading options that are off by default.