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Vulnerability record · CVE-2019-10773 · published 16 December 2019

CVE-2019-10773: Yarnpkg yarn link following vulnerability

Yarnpkg · Yarn

In Yarn before 1.21.1, the package install functionality can be abused to generate arbitrary symlinks on the host filesystem by using specially crafted "bin" keys. Existing files could be overwritten depending on the current user permission set.

7.8 CVSS 3.1 High EPSS 1.5% · top 26.5% CWE-59 · Link following
7.8CVSS 3.1 base score, v2 6.8
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Yarn before 1.21.1, the package install functionality can be abused to generate arbitrary symlinks on the host filesystem by using specially crafted "bin" keys. Existing files could be overwritten depending on the current user permission set.

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

Affected products

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

References

LinkTags
https://access.redhat.com/errata/RHSA-2020:0475
https://blog.daniel-ruf.de/critical-design-flaw-npm-pnpm-yarn/ ExploitThird Party Advisory
https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7 PatchThird Party Advisory
https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023 ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITY5BC63CCC647DFNUQRQ5A
https://snyk.io/vuln/SNYK-JS-YARN-537806%2C
https://access.redhat.com/errata/RHSA-2020:0475
https://blog.daniel-ruf.de/critical-design-flaw-npm-pnpm-yarn/ ExploitThird Party Advisory
https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7 PatchThird Party Advisory
https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023 ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITY5BC63CCC647DFNUQRQ5A
https://snyk.io/vuln/SNYK-JS-YARN-537806%2C

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2019-10773), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.