Prototype pollution in merge
Priority MEDIUM 45CWE-915Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-915.
Summary
All versions of package merge are vulnerable to Prototype Pollution via _recursiveMerge .
Why it matters now
EPSS 0.01443 73rd percentileScored 2026-11-07
Fix Fixed merge (npm): 2.1.1
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 |
|---|---|---|---|---|---|
| — | merge | all versions | — | No fix listed | CNA |
| — | merge (npm) | before 2.1.1 | 2.1.1 | Patch available | GHSA-7wpw-2hjm-89gp |
- merge Vendor— Affected all versions Fixed in — No fix listed CNA
- merge (npm) Vendor— Affected before 2.1.1 Fixed in 2.1.1 Patch available GHSA-7wpw-2hjm-89gp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:merge_project:merge:*:*:*:*:*:node.js:*:* | before 2.1.1 | Vulnerable | Merge Project |
- cpe:2.3:a:merge_project:merge:*:*:*:*:*:node.js:*:* Versions before 2.1.1 Vulnerable ·Merge Project
Remediation
- Fix · GHSA-7wpw-2hjm-89gp merge (npm) Fixed in 2.1.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-28499
- 2026-10-03 Alias added: GHSA-7wpw-2hjm-89gp
References
Other 4
- https://github.com/yeikos/js.merge/blob/master/src/index.ts%23L64
- https://github.com/yeikos/js.merge/commit/7b0ddc2701d813f2ba289b32d6a4b9d4cc235fb4
- https://github.com/yeikos/js.merge/blob/56ca75b2dd0f2820f1e08a49f62f04bbfb8c5f8f/src/index.ts#L64
- https://github.com/yeikos/js.merge/blob/master/src/index.ts#L64
More Merge Project Merge vulnerabilities
- TI-2021-02590 Prototype Pollution in viking04/merge CVSS 3.1CRITICAL 9.8
- TI-2021-06090 Prototype pollution in @ianwalter/merge CVSS 3.1CRITICAL 9.8
- TI-2018-11811 Uncontrolled resource consumption in HackerOne merge CVSS 3.1HIGH 7.5
Sources
- CVE-2020-28499 · CVE Program
- CVE-2020-28499 · NVD
- FIRST EPSS
- GHSA-7wpw-2hjm-89gp · GitHub Advisory Database · CC BY 4.0
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