CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2019-15608
Medium (5.9) in yarnpkg yarn. EPSS 1.8% chance of exploitation in the next 30 days. Fixed in yarn 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.
Severity
- EPSS
- 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-367, CWE-840
- Published
- Modified
- Record from
- the NVD, synced
Affected
- yarnpkg:yarn
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-hjxc-462x-x77j | npm | yarn | <1.19.0 | 1.19.0 |
References
- https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190
- https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c
- https://hackerone.com/reports/703138
- https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190
- https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c