Prototype Pollution in jsonata-js Affecting Function Binding Frame System
CVE-2026-12208

6.9MEDIUM

Key Information:

Vendor

Jsonata-js

Status
Jsonata
Vendor
CVE Published:
15 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-12208?

A vulnerability exists in jsonata-js versions up to 2.2.0 that allows for prototype pollution via the createFrame function in the Function Binding Frame System. This weakness enables an attacker to manipulate object prototype attributes in an improper manner. The attack can be executed remotely, posing a significant risk to affected systems. Despite early notification to the vendor, there has been no response, making it critical for users to review their implementations of jsonata-js for potential exposure.

Affected Version(s)

jsonata 2.0

jsonata 2.1

jsonata 2.2.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-12208 - Proof of Concept

References

https://vuldb.com/vuln/370850
vdb-entrytechnical-description
https://vuldb.com/vuln/370850/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-12208
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Frederick (VulDB User)
VulDB CNA Team
.