All the vulnerabilities related to the version 1.21.0 of the package
Yarn Improper link resolution before file access (Link Following)
In Yarn before 1.21.1, the package install functionality can be abused to generate arbitrary symlinks on the host filesystem by using specially crafted "bin" keys. Existing files could be overwritten depending on the current user permission set.
Path Traversal in Yarn
Arbitrary filesystem write vulnerability in Yarn 1.21.1 and earlier allows attackers to write to any path on the filesystem and potentially lead to arbitrary code execution by forcing the user to install a malicious package.
Yarn untrusted search path vulnerability
An untrusted search path vulnerability was found in Yarn. When a victim runs certain Yarn commands in a directory with attacker-controlled content, malicious commands could be executed in unexpected ways.
