The package integrity validation in yarn < 1.19.0 contains a TOCTOU vulnerability where the hash is computed before writing a package to cache. It's not computed again when reading from the cache. This may lead to a cache pollution attack.
{ "availability": "No subscription required", "binaries": [ { "binary_version": "1.19.1-1", "binary_name": "yarnpkg" } ] }
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-15608.json"