JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, crafted JSONata expressions could chain several object-integrity weaknesses to execute arbitrary code. The chain could overwrite $clone to mutate objects through evaluateTransformExpression, expose and deconstruct JSONata functions or lambdas through $merge.*, replace proc.arguments.forEach used by applyProcedure, and forge internal lambda state. These primitives allowed an attacker to reach prototype getters, prototype and constructor access, and process.getBuiltinModule with child_process, executing code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.1.
CVE-2026-77415
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: 0.5%, top 59% 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: 1%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
- 1%
- EPSS %ILE
- 41%
- KEV
- Not listed
Published
August 21, 2026
Last Modified
August 25, 2026
Advisory Details (10)
Auto-updated Aug 25, 2026Patch available. Sources: github_commit, github_pr, github_release.
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/v2.2.1github_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 object contructor setting internal flags
Patch available: jsonata-js/jsonata v2.2.1 (PR #802 merged 2026-05-19)
https://github.com/jsonata-js/jsonata/pull/802github_pr Patch Available
Wildcards should not unwrap function objects
Patch available: jsonata-js/jsonata v2.2.1 (PR #800 merged 2026-05-19)
https://github.com/jsonata-js/jsonata/pull/800github_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/799github_commit Patch Available
commit f174348c7fa3 (jsonata-js/jsonata)
Patch available: jsonata-js/jsonata v2.2.1 (contains commit f174348c7fa3)
https://github.com/jsonata-js/jsonata/commit/f174348c7fa30f271b63ddedf0767e814004bc4dgithub_commit Patch Available
commit f09df8416eab (jsonata-js/jsonata)
Patch available: jsonata-js/jsonata v1.8.8 (contains commit f09df8416eab)
https://github.com/jsonata-js/jsonata/commit/f09df8416eab8ff44926fc6527c80fb8701de159github_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/59e25144fc3b7125f6befd71b8a6e14e1fa610d2github_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/4b217d514376e30cba278941298d7ba97c4a6c6egithub_commit Patch Available
commit 47c0e5854220 (jsonata-js/jsonata)
Patch available: jsonata-js/jsonata v2.2.1 (contains commit 47c0e5854220)
https://github.com/jsonata-js/jsonata/commit/47c0e58542202c705726663166dbee5fcae47d06Vendor Advisories for CVE-2026-77415(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 | — | 2.2.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 15× 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 16:14 UTCEG score recompute
- 2026-08-26 14:47 UTCEPSS rescore
- 2026-08-25 21:09 UTCEG score recompute
- 2026-08-25 17:26 UTCEG score recompute
- 2026-08-25 17:15 UTCEG score recompute
- 2026-08-25 15:14 UTCEG score recompute
- 2026-08-25 13:49 UTCEPSS rescore
- 2026-08-24 16:56 UTCEG score recompute
- 2026-08-24 14:18 UTCEPSS rescore
- 2026-08-24 12:32 UTCEG score recompute
- 2026-08-23 03:08 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescore
- 2026-08-21 21:24 UTCEG score recompute
- 2026-08-21 21:05 UTCEG score recompute
- 2026-08-21 21:04 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-77415?
CVE-2026-77415 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, crafted JSONata expressions could chain several object-integrity weaknesses to execute arbitrary code. The chain could overwrite $clone to mutate objects through evaluateTransformExpression, expose and deconstruct…
When was CVE-2026-77415 disclosed?
CVE-2026-77415 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77415 actively exploited?
CVE-2026-77415 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.8% of all scored CVEs.
What is the CVSS score of CVE-2026-77415?
CVE-2026-77415 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-77415?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77415, 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-2026-77415
Is Your Infrastructure Affected by CVE-2026-77415?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.