PatchTheCVECVE-2020-7770: This affects the package json8 before 1.0.3
CVE-2020-7770 is a medium-severity flaw (CVSS 6.5) affecting json8. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 1.9% (top 20%) |
| CISA exploited list | No |
| Weakness | CWE-1321 |
| Published | 2020-11-12 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-7770?
json8: upgrade to 1.0.3. Exact commands for each OS are on this page.
Is CVE-2020-7770 being exploited?
CVE-2020-7770 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-7770 affect?
CVE-2020-7770 affects json8. Severity is medium (CVSS 6.5). This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.
How urgent is CVE-2020-7770?
Priority 48/100. Public exploit reference