CVE-2021-4435: Yarn: untrusted search path

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-04 · updated 2026-06-17
Weakness: CWE-426

Description

An untrusted search path vulnerability was found in Yarn. When a victim runs certain Yarn commands in a directory with attacker-controlled content, malicious commands could be executed in unexpected ways.

Affected products

yarn: before 1.22.13 — fixed in 1.22.13

How to fix

Upgrade to a fixed version: yarn 1.22.13. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2021-4435
https://bugzilla.redhat.com/show_bug.cgi?id=2262284
https://github.com/yarnpkg/yarn/commit/67fcce88935e45092ffa2674c08053f1ef5268a1
https://github.com/yarnpkg/yarn/releases/tag/v1.22.13
https://access.redhat.com/security/cve/CVE-2021-4435
https://bugzilla.redhat.com/show_bug.cgi?id=2262284
https://github.com/yarnpkg/yarn/commit/67fcce88935e45092ffa2674c08053f1ef5268a1
https://github.com/yarnpkg/yarn/releases/tag/v1.22.13

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