CVE-2020-7770
Prototype Pollution
CRITICAL
9.8
CVSS Score
Published: November 12, 2020 at 10:15 AM UTC
Updated: June 17, 2026 at 03:25 AM UTC
1 product affected across 1 vendorJSON8
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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
95%
v < 1.0.3
Affected range stops below 1.0.3, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7ex_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://snyk.io/vuln/SNYK-JS-JSON8-1017116CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-1321
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