CVE-2020-8268 json
Prototype pollution in json8-merge-patch
published 2020-11-09 5 y ago modified 2026-06-17 4 mo ago also GHSA-8v9x-9xqg-r8mr , EUVD-2021-1022
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
Prototype pollution vulnerability in json8-merge-patch npm package < 1.0.3 may allow attackers to inject or modify methods and properties of the global object constructor.
Patch / fix
- npm json8-merge-patch 1.0.3
- json8-merge-patch_project json8-merge-patch 1.0.3
Exploit prediction
1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/980649 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | json8-merge-patch | <1.0.3 |
1.0.3 |
Affected products
- n/a json8-merge-patch
Classification
References
-
github.com
/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7e#diff-faa7bef039022bc7ca1c613331b2373950ddd3d65eb
web
-
hackerone.com
/reports/980649
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-8268
advisory
-
github.com
/sonnyp/JSON8/issues/113
web
-
npmjs.com
/package/json8-merge-patch
web
Sources
- CVE List CVE-2020-8268
- GitHub Advisory GHSA-8v9x-9xqg-r8mr
- NVD CVE-2020-8268
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.