Prototype Pollution in upmerge
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- Security bypass, Denial of service
- Confidentiality · integrity · availability
- —
- Fix status
- No fix listed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-345 and CWE-400.
Summary
All versions of `upmerge` are vulnerable to Prototype Pollution. The merge() function fails to prevent user input to alter an Object's prototype, allowing attackers to modify override properties of all objects in the application. This may lead to Denial of Service or may be chained with other vulnerabilities leading to Remote Code Execution. ## Recommendation No fix is currently available. Consider using an alternative module until a fix is made available.
Why it matters now
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 |
|---|---|---|---|---|---|
| — | upmerge (npm) | up to 0.1.8 | — | No fix listed | GHSA-gm9g-2g8v-fvxj |
- upmerge (npm) Vendor— Affected up to 0.1.8 Fixed in — No fix listed GHSA-gm9g-2g8v-fvxj
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-03 Threatist record created from GHSA-gm9g-2g8v-fvxj
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences