CVE-2021-26275 — eslint-fixer
CRITICALCVE-2021-26275 is a critical-severity (CVSS 9.8) CWE-77 vulnerability in eslint-fixer. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.
Command injection in eslint-fixer
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2021-26275.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-26275 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
eslint-fixernpmDescription
The eslint-fixer package through 0.1.5 for Node.js allows command injection via shell metacharacters to the fix function. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. The ozum/eslint-fixer GitHub repository has been intentionally deleted.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | eslint-fixer | all versions | No fix |
Affected Products
eslint-fixereslint-fixer_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for eslint-fixer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of eslint-fixer has shipped for CVE-2021-26275 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is CVE-2021-26275 in your dependencies?
Find it across npm, including transitive dependencies.