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Vulnerability record · CVE-2019-15608 · published 15 March 2020

CVE-2019-15608: Yarnpkg yarn toctou race condition vulnerability

Yarnpkg · Yarn

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.

5.9 CVSS 3.1 Medium EPSS 1.8% · top 22.0% CWE-840 · CWE-840CWE-367 · TOCTOU race condition
5.9CVSS 3.1 base score, v2 4.3
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190
https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c
https://hackerone.com/reports/703138 ExploitMitigationThird Party Advisory
https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190
https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c
https://hackerone.com/reports/703138 ExploitMitigationThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-15608), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.