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.
CVE-2026-77413
CRITICALPre-NVD 9.39.3—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 66% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.3
- EG Score
- 9.3(medium)
- EG Risk
- 73(Attend)EG Risk 73/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity93% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 34%
- KEV
- Not listed
Published
August 21, 2026
Last Modified
August 24, 2026
Advisory Details (6)
Auto-updated Aug 25, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available
Arbitrary Code Execution via crafted JSONata expressions · Advisory · jsonata-js/jsonata · GitHub
https://github.com/jsonata-js/jsonata/security/advisories/GHSA-8gq3-vp5j-2grpgithub_release Patch Available
2.2.0 Milestone Release
Patch available: jsonata-js/jsonata v2.2.0
https://github.com/jsonata-js/jsonata/releases/tag/v2.2.0github_release Patch Available
1.8.8 Security Release
Patch available: jsonata-js/jsonata v1.8.8
https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8github_pr Patch Available
prevent $lookup from accessing object prototype members
Patch available: jsonata-js/jsonata v2.2.0 (PR #794 merged 2026-05-14)
https://github.com/jsonata-js/jsonata/pull/794github_commit Patch Available
commit 4c5f4adfb90a (jsonata-js/jsonata)
Patch available: jsonata-js/jsonata v2.2.0 (contains commit 4c5f4adfb90a)
https://github.com/jsonata-js/jsonata/commit/4c5f4adfb90a9b500889d50f90050ca68888b50dgithub_commit Patch Available
commit 4b217d514376 (jsonata-js/jsonata)
Patch available: jsonata-js/jsonata v1.8.8 (contains commit 4b217d514376)
https://github.com/jsonata-js/jsonata/commit/4b217d514376e30cba278941298d7ba97c4a6c6eVendor Advisories for CVE-2026-77413(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| jsonata | — | 1.8.8 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-26 17:52 UTCEG score recompute
- 2026-08-26 14:47 UTCEPSS rescore
- 2026-08-25 16:37 UTCEG score recompute
- 2026-08-25 13:49 UTCEPSS rescore
- 2026-08-24 20:27 UTCEG score recompute
- 2026-08-24 19:51 UTCEG score recompute
- 2026-08-24 18:02 UTCEG score recompute
- 2026-08-24 14:18 UTCEPSS rescore
- 2026-08-24 09:58 UTCEG score recompute
- 2026-08-23 01:37 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescore
- 2026-08-21 21:24 UTCEG score recompute
- 2026-08-21 20:55 UTCEG score recompute
- 2026-08-21 20:54 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-94
- CVE-2003-1432EG 10.0EPSS p94HIGH
- CVE-2002-0495EG 10.0EPSS p96HIGH
- CVE-1999-0702EG 10.0EPSS p98HIGH
- CVE-1999-0509EG 10.0EPSS p98HIGH
- CVE-2006-1318EG 9.3EPSS p97HIGH
- CVE-2006-1301EG 9.3EPSS p95HIGH
- CVE-2006-1308EG 9.3EPSS p95HIGH
- CVE-2006-1309EG 9.3EPSS p95HIGH
- CVE-2006-1304EG 9.3EPSS p96HIGH
- CVE-2006-1306EG 9.3EPSS p95HIGH
Frequently asked(5)
What is CVE-2026-77413?
CVE-2026-77413 is a critical vulnerability published on August 21, 2026. 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…
When was CVE-2026-77413 disclosed?
CVE-2026-77413 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77413 actively exploited?
CVE-2026-77413 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.2% of all scored CVEs.
What is the CVSS score of CVE-2026-77413?
CVE-2026-77413 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-77413?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77413, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-77413
Is Your Infrastructure Affected by CVE-2026-77413?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.