Prototype pollution in extend2
Priority MEDIUM 45CWE-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
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.
Why it matters now
EPSS 0.01498 74th percentileScored 2026-11-07
Fix Fixed extend2: 1.0.1extend2 (npm): 1.0.1
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 |
|---|---|---|---|---|---|
| — | extend2 | before 1.0.1 | 1.0.1 | Patch available | CNA |
| — | extend2 (npm) | before 1.0.1 | 1.0.1 | Patch available | GHSA-gjm5-83cw-p3p2 |
- extend2 Vendor— Affected before 1.0.1 Fixed in 1.0.1 Patch available CNA
- extend2 (npm) Vendor— Affected before 1.0.1 Fixed in 1.0.1 Patch available GHSA-gjm5-83cw-p3p2
Remediation
- Fix · CNA extend2 Fixed in 1.0.1
- Fix · GHSA-gjm5-83cw-p3p2 extend2 (npm) Fixed in 1.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23568
- 2026-10-03 Alias added: GHSA-gjm5-83cw-p3p2
References
Sources
- CVE-2021-23568 · CVE Program
- CVE-2021-23568 · NVD
- FIRST EPSS
- GHSA-gjm5-83cw-p3p2 · GitHub Advisory Database · CC BY 4.0
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