Yarn: untrusted search path

published 2024-02-04 2 y ago modified 2026-09-10 1 mo ago also GHSA-mpwj-fcr6-x34c , EUVD-2024-0674

cvss: 7.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 1 links 2

npm yarn 1.22.13
yarnpkg yarn 1.22.13

node-yarnpkg Debian 14, Debian 13, Debian 12 1.22.19+~cs24.27.18-1

debian advisories DEBIAN-CVE-2021-4435

github.com/yarnpkg/yarn@67fcce8 commit
github.com/yarnpkg/yarn/releases/tag/v1.22.13 release

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4435 updated 2025-11-21 cvss 7.7

yarn: untrusted search path

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 16 mo ago (2025-06-17)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.7	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub	3.1	7.7	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	yarn	<1.22.13	1.22.13

Affected products

n/a yarn
Fedora Fedora
Fedora Extra Packages for Enterprise Linux

Classification

Weakness

CWE-426 Untrusted Search Path

References

github.com /yarnpkg/yarn/commit/67fcce88935e45092ffa2674c08053f1ef5268a1
web, patch
access.redhat.com /security/cve/CVE-2021-4435
vdb-entry, web, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=2262284
issue-tracking, web
github.com /yarnpkg/yarn/releases/tag/v1.22.13
web, release-notes
nvd.nist.gov /vuln/detail/CVE-2021-4435
advisory
github.com /yarnpkg/yarn
package

Sources

CVE List CVE-2021-4435
GitHub Advisory GHSA-mpwj-fcr6-x34c
NVD CVE-2021-4435

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary