Prototype pollution in Proto
Priority LOW 34CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
Why it matters now
EPSS 0.00861 58th 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 |
|---|---|---|---|---|---|
| — | Proto | all versions | — | No fix listed | CNA |
| — | Proto (npm) | up to 1.1.4 | — | No fix listed | GHSA-58g2-9fqr-36q2 |
- Proto Vendor— Affected all versions Fixed in — No fix listed CNA
- Proto (npm) Vendor— Affected up to 1.1.4 Fixed in — No fix listed GHSA-58g2-9fqr-36q2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:proto_project:proto:-:*:*:*:*:node.js:*:* | not specified by NVD | Vulnerable | Proto Project |
- cpe:2.3:a:proto_project:proto:-:*:*:*:*:node.js:*:* Versions not specified by NVD Vulnerable ·Proto Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23426
- 2026-10-03 Alias added: GHSA-58g2-9fqr-36q2
References
Sources
- CVE-2021-23426 · CVE Program
- CVE-2021-23426 · NVD
- FIRST EPSS
- GHSA-58g2-9fqr-36q2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences