Prototype pollution in patchmerge
Priority HIGH 82CWE-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 · CISA ADP. Fix status from CNA and GitHub.
Summary
Prototype pollution vulnerability in 'patchmerge' versions 1.0.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.03507 89th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed patchmerge (npm): 1.0.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | patchmerge | 1.0.0, 1.0.1 | — | No fix listed | CNA |
| — | patchmerge (npm) | 1.0.0 to before 1.0.2 | 1.0.2 | Patch available | GHSA-84g3-cv89-m9gm |
- patchmerge Vendor— Affected 1.0.0, 1.0.1 Fixed in — No fix listed CNA
- patchmerge (npm) Vendor— Affected 1.0.0 to before 1.0.2 Fixed in 1.0.2 Patch available GHSA-84g3-cv89-m9gm
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:patchmerge_project:patchmerge:*:*:*:*:*:node.js:*:* | 1.0.0 – 1.0.1 | Vulnerable | Patchmerge Project |
- cpe:2.3:a:patchmerge_project:patchmerge:*:*:*:*:*:node.js:*:* Versions 1.0.0 – 1.0.1 Vulnerable ·Patchmerge Project
Remediation
- Fix · GHSA-84g3-cv89-m9gm patchmerge (npm) Fixed in 1.0.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-25916
- 2026-10-03 Alias added: GHSA-84g3-cv89-m9gm
References
Sources
- CVE-2021-25916 · CVE Program
- CVE-2021-25916 · NVD
- FIRST EPSS
- GHSA-84g3-cv89-m9gm · GitHub Advisory Database · CC BY 4.0
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