Prototype Pollution in Merge-Deep Project
CVE-2021-26707
The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in the program, thus facilitating prototype-pollution attacks against applications using this library.
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: 0.019 (79.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.npmjs.com/package/merge-deep (Product, Third Party Advisory)
- github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d… (Patch, Third Party Advisory)
- securitylab.github.com/advisories/GHSL-2020-160-merge-deep/ (Third Party Advisory)
- security.netapp.com/advisory/ntap-20210716-0008/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-26707?
- CVE-2021-26707 is a critical-severity vulnerability in Merge-Deep Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2021-06-02.
- How severe is CVE-2021-26707?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-26707 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.