What’s Vulnerable › Vulnerabilities

CVE-2019-10773

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-16 · updated 2026-06-17
• Weakness: CWE-59

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.

Affected products

• yarn: before 1.21.1 — fixed in 1.21.1

How to fix

Upgrade to a fixed version: yarn 1.21.1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2020:0475
• https://blog.daniel-ruf.de/critical-design-flaw-npm-pnpm-yarn/
• https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7
• https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3FHYKZ6ZJ5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITY5BC63CCC647DFNUQRQ5AJDKUKUNBI/
• 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/
• https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7
• https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3FHYKZ6ZJ5/

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