Answer in brief
CVE-2026-12208 records a Medium severity (CVSS 5.3) vulnerability in jsonata: Function Binding Prototype Pollution via hasOwnProperty Override. The current sources do not mark it as known exploited. The current feed maps jsonata (npm), jsonata (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps jsonata (npm), jsonata (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| jsonatanpm | <1.8.8 | 1.8.8 |
| jsonatanpm | >=2.0.0,<2.2.1 | 2.2.1 |
Published upstream
Jun 15, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Sep 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.