CVE-2026-77414

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% 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
Trending — 3 sources updated this weekElevated
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.

JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, the src/jsonata.js environment.lookup function used a bypassable hasOwnProperty check. Crafted expressions could use $hasOwnProperty, $spread, $string, prototype access, and $constructor to reach the object prototype and invoke process.getBuiltinModule with child_process, executing arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.1.

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 computed
Severity93% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 26, 2026

Advisory Details (5)

Auto-updated Aug 23, 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-2943-5xfg-gq5f
github_release Patch Available

2.2.1 Maintenance Release

Patch available: jsonata-js/jsonata v2.2.1

https://github.com/jsonata-js/jsonata/releases/tag/v2.2.1
github_release Patch Available

1.8.8 Security Release

Patch available: jsonata-js/jsonata v1.8.8

https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8
github_pr Patch Available

Prevent object prototype pollution

Patch available: jsonata-js/jsonata v2.2.1 (PR #799 merged 2026-05-19)

https://github.com/jsonata-js/jsonata/pull/799
github_commit Patch Available

commit 59e25144fc3b (jsonata-js/jsonata)

Patch available: jsonata-js/jsonata v2.2.1 (contains commit 59e25144fc3b)

https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2

Vendor Advisories for CVE-2026-77414(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)
PackageVulnerable rangeFixed inDependents
jsonata—2.2.1—

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.

  1. 2026-08-26 18:24 UTCEG score recompute
  2. 2026-08-26 18:07 UTCEG score recompute
  3. 2026-08-26 15:10 UTCEG score recompute
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-25 16:58 UTCEG score recompute
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 14:41 UTCEG score recompute
  8. 2026-08-24 14:18 UTCEPSS rescore
  9. 2026-08-24 10:20 UTCEG score recompute
  10. 2026-08-23 03:50 UTCEG score recompute
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-21 21:24 UTCEG score recompute
  13. 2026-08-21 20:55 UTCEG score recompute
  14. 2026-08-21 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77414?
CVE-2026-77414 is a critical vulnerability published on August 21, 2026. JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, the src/jsonata.js environment.lookup function used a bypassable hasOwnProperty check. Crafted expressions could use $hasOwnProperty, $spread, $string, prototype access, and $constructor to reach the object prototype and…
When was CVE-2026-77414 disclosed?
CVE-2026-77414 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77414 actively exploited?
CVE-2026-77414 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 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-77414?
CVE-2026-77414 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-77414?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77414, 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-2026-77414

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