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.
{
"extracted_events": [
{
"cpe": "cpe:2.3:a:yarnpkg:yarn:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.19.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "0474b8c66a8ea298f5e4dedc67b2de464297ad1c"
}
],
"source": "REFERENCES_COMMIT"
}
]
}