by Kastro
Paper/Archive/CVE-2026-77413

CVE-2026-77413

jsonata-js jsonata — JSONata: Arbitrary Code Execution via crafted JSONata expressions

EPSS 0.7%public exploitCVSS 9.3
critical.is priorityof 100
49
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 53.9.539 × 2010.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.0, the src/functions.js lookup function lacked an Object.prototype.hasOwnProperty check and allowed crafted expressions to access inherited prototype members. An attacker able to supply an expression could use inherited prototype setters and getters, constructor access, valueOf, and process.getBuiltinModule to reach the child_process module and execute arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.0.

Affected

ProductAffectedFixed inSource
jsonata< 2.2.0–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/jsonata-js/jsonata/security/advisories/GHSA-8gq3-vp5j-2grprefgithub.com/jsonata-js/jsonata/pull/794refgithub.com/jsonata-js/jsonata/commit/4b217d514376e30cba278941298d7ba97c4a6c6erefgithub.com/jsonata-js/jsonata/commit/4c5f4adfb90a9b500889d50f90050ca68888b50drefgithub.com/jsonata-js/jsonata/releases/tag/v1.8.8refgithub.com/jsonata-js/jsonata/releases/tag/v2.2.0