Medium severity · published Jun 15, 2026
CVE-2026-12208
jsonata-js jsonata Function Binding Frame System jsonata.js createFrame prototype pollution
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
A weakness has been identified in jsonata-js jsonata up to 2.2.0. The affected element is the function createFrame of the file src/jsonata.js of the component Function Binding Frame System. This manipulation causes improperly controlled modification of object prototype attributes. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JS
jsonata · jsonata-js
2.0; 2.1; 2.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12208
github.com
https://github.com/OriginSecurityX/jsonata-hasownproperty-bypass
vuldb.com
https://vuldb.com/cve/CVE-2026-12208
vuldb.com
https://vuldb.com/submit/832446
vuldb.com
https://vuldb.com/vuln/370850
vuldb.com
https://vuldb.com/vuln/370850/cti
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