Answer in brief
CVE-2026-77415 records a Critical severity (CVSS 9.3) vulnerability in JSONata: Arbitrary Code Execution via crafted JSONata expressions. The current sources do not mark it as known exploited. The current feed maps jsonata-js/jsonata (generic), 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 9.3. 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-js/jsonata (generic), jsonata (npm), jsonata (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| jsonata-js/jsonatageneric | < 1.8.8 || >= 2.0.0, < 2.2.1 | Not reported |
| jsonatanpm | >=2.0.0,<2.2.1 | 2.2.1 |
| jsonatanpm | <1.8.8 | 1.8.8 |
Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 21, 2026
JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, crafted JSONata expressions could chain several object-integrity weaknesses to execute arbitrary code. The chain could overwrite $clone to mutate objects through evaluateTransformExpression, expose and deconstruct JSONata functions or lambdas through $merge.*, replace proc.arguments.forEach used by applyProcedure, and forge internal lambda state. These primitives allowed an attacker to reach prototype getters, prototype and constructor access, and process.getBuiltinModule with child_process, executing code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.1.
Quoted source text, attributed separately from HOL analysis.