Prototype pollution in merge-deep2
Priority MEDIUM 44CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
All versions of package merge-deep2 are vulnerable to Prototype Pollution via the mergeDeep() function.
Why it matters now
EPSS 0.0121 68th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | merge-deep2 | all versions | — | No fix listed | CNA |
| — | merge-deep2 (npm) | up to 3.0.6 | — | No fix listed | GHSA-j28q-p8ww-cp87 |
- merge-deep2 Vendor— Affected all versions Fixed in — No fix listed CNA
- merge-deep2 (npm) Vendor— Affected up to 3.0.6 Fixed in — No fix listed GHSA-j28q-p8ww-cp87
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:merge-deep2_project:merge-deep2:*:*:*:*:*:node.js:*:* | all versions | Vulnerable | Merge-deep2 Project |
- cpe:2.3:a:merge-deep2_project:merge-deep2:*:*:*:*:*:node.js:*:* Versions all versions Vulnerable ·Merge-deep2 Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23700
- 2026-10-03 Alias added: GHSA-j28q-p8ww-cp87
References
Sources
- CVE-2021-23700 · CVE Program
- CVE-2021-23700 · NVD
- FIRST EPSS
- GHSA-j28q-p8ww-cp87 · GitHub Advisory Database · CC BY 4.0
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