Prototype Pollution in Substack Minimist
CVE-2021-44906
Minimist <=1.2.5 is vulnerable to Prototype Pollution via file index.js, function setKey() (lines 69-95).
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.046 (91.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- snyk.io/vuln/SNYK-JS-MINIMIST-559764 (Exploit, Patch, Third Party Advisory, Not Applicable)
- github.com/Marynk/JavaScript-vulnerability-detection/blob/main/minimist PoC.zip (Exploit, Third Party Advisory)
- github.com/substack/minimist/blob/master/index.js (Exploit, Third Party Advisory)
- stackoverflow.com/questions/8588563/adding-custom-properties-to-a-function/2027… (Third Party Advisory, Issue Tracking)
- github.com/substack/minimist/issues/164 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20240621-0006/
Frequently asked questions
- What is CVE-2021-44906?
- CVE-2021-44906 is a critical-severity vulnerability in Substack Minimist, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2022-03-17.
- How severe is CVE-2021-44906?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-44906 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.