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No exploitation reportedFix available

CVE-2021-4435

No exploitation reported by the sources we read.

  • Published2024-02-04
  • Fixed in1.22.13
  • WeaknessCWE-426

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2024-02-0420:15CVE publishedNVD

Versions per branch

NVD · OSV
Yarnpkg yarn
BranchAffectedFixed in
1.22< 1.22.131.22.13

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As fedora, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-02-04

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/yarnRoot:npmall versions · fixed in 1.21.1-root.io.1
  • node-yarnpkgUbuntu:26.10all versions · no fixed version listed
  • node-yarnpkgUbuntu:26.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:25.10all versions · no fixed version listed
  • node-yarnpkgUbuntu:24.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:22.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:20.04:LTSall versions · no fixed version listed
  • node-yarnpkgDebian:14all versions · fixed in 1.22.19+~cs24.27.18-1

8 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Yarnpkg yarn to 1.22.13

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2025-06-17
  • CNACVSS 3.17.7known since 2026-10-23
  • NVDCVSS 3.17.8read 2026-10-23
  • CNAweakness (CWE)CWE-426known since 2026-10-23
  • NVDweakness (CWE)CWE-426read 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2024-02-05

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2024-02-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-mpwj-fcr6-x34c

Frequently asked questions

What is CVE-2021-4435?

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.

Is CVE-2021-4435 actively exploited?

Active exploitation of CVE-2021-4435 has not been confirmed. Its EPSS score was 0.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-4435?

CVE-2021-4435 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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