CVE-2018-3751 json
Prototype Pollution in merge-recursive
published 2018-07-03 8 y ago modified 2026-06-17 4 mo ago also GHSA-cvxm-f295-x957 , EUVD-2018-0453
- cvss
- 9.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 73%
- public exploits
- 0
- none known
Summary
The utilities function in all versions <= 0.3.0 of the merge-recursive node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function. This can let an attacker add or modify existing properties that will exist on all objects.
Exploit prediction
1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/311337 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | merge-recursive | <=0.0.3 |
no fix listed |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
hackerone.com
/reports/311337
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2018-3751
advisory
-
github.com
/advisories/GHSA-cvxm-f295-x957
advisory
-
npmjs.com
/advisories/715
web
Sources
- CVE List CVE-2018-3751
- GitHub Advisory GHSA-cvxm-f295-x957
- NVD CVE-2018-3751
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.