CVE-2026-77415

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: 0.6%, top 51% 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
Elevated
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.

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.

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
1%
EPSS %ILE
49%
KEV
Not listed

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (10)

Auto-updated Sep 14, 2026
Patch 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/v2.2.1
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 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/802
github_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/800
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 f174348c7fa3 (jsonata-js/jsonata)

Patch available: jsonata-js/jsonata v2.2.1 (contains commit f174348c7fa3)

https://github.com/jsonata-js/jsonata/commit/f174348c7fa30f271b63ddedf0767e814004bc4d
github_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/f09df8416eab8ff44926fc6527c80fb8701de159
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
github_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/4b217d514376e30cba278941298d7ba97c4a6c6e
github_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/47c0e58542202c705726663166dbee5fcae47d06

Vendor 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)
PackageVulnerable rangeFixed inDependents
jsonata—1.8.8—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 59× 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. 2026-09-19 16:27 UTCEG score recompute
  2. 2026-09-18 21:37 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 21:16 UTCEG score recompute
  5. 2026-09-16 14:19 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 09:34 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 06:15 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-13 20:08 UTCEG score recompute
  13. 2026-09-12 18:07 UTCEG score recompute
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-11 15:49 UTCEG score recompute
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 12:06 UTCEG score recompute
  18. 2026-09-10 12:16 UTCEG score recompute
  19. 2026-09-10 09:35 UTCEPSS rescore
  20. 2026-09-09 01:44 UTCEG score recompute
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 19:35 UTCEG score recompute
  23. 2026-09-06 16:51 UTCEG score recompute
  24. 2026-09-06 13:48 UTCEPSS rescore
  25. 2026-09-05 18:31 UTCEG score recompute
Show 34 more
  1. 2026-09-04 15:03 UTCEG score recompute
  2. 2026-09-04 07:34 UTCEG score recompute
  3. 2026-09-04 05:07 UTCEPSS rescore
  4. 2026-09-02 15:11 UTCEG score recompute
  5. 2026-09-02 14:12 UTCEPSS rescore
  6. 2026-09-01 16:37 UTCEG score recompute
  7. 2026-09-01 13:54 UTCEPSS rescore
  8. 2026-09-01 05:18 UTCEG score recompute
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-09-01 04:40 UTCEPSS rescore
  11. 2026-08-30 22:05 UTCEG score recompute
  12. 2026-08-30 19:18 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 03:26 UTCEG score recompute
  15. 2026-08-30 01:22 UTCEPSS rescore
  16. 2026-08-29 01:03 UTCEG score recompute
  17. 2026-08-28 21:42 UTCEPSS rescore
  18. 2026-08-27 14:36 UTCEG score recompute
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 16:14 UTCEG score recompute
  21. 2026-08-26 14:47 UTCEPSS rescore
  22. 2026-08-25 21:09 UTCEG score recompute
  23. 2026-08-25 17:26 UTCEG score recompute
  24. 2026-08-25 17:15 UTCEG score recompute
  25. 2026-08-25 15:14 UTCEG score recompute
  26. 2026-08-25 13:49 UTCEPSS rescore
  27. 2026-08-24 16:56 UTCEG score recompute
  28. 2026-08-24 14:18 UTCEPSS rescore
  29. 2026-08-24 12:32 UTCEG score recompute
  30. 2026-08-23 03:08 UTCEG score recompute
  31. 2026-08-23 00:19 UTCEPSS rescore
  32. 2026-08-21 21:24 UTCEG score recompute
  33. 2026-08-21 21:05 UTCEG score recompute
  34. 2026-08-21 21:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 September 9, 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 50.5% 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

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