| Package | Affected versions | Patched versions |
|---|---|---|
| yarn | < 1.19.0 | 1.19.0 |
| yarn | < 1.19.0 | 1.19.0 |
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. This issue is fixed in 1.19.0.
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