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: 0.6% (45th percentile of EPSS-scored CVEs). 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 — Patch released 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: 0.6%CVSS: 9.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
9.3CRITICALmedium confidence
EG Risk
73
EG Risk 73/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Oct 3, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr, github_release.
githubMentions a patch (unverified)🟡 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(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets:17912507942026-10-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
jsonata—
  • 2.0.0 up to 2.2.1: fixed in 2.2.1
  • every version up to 1.8.8: fixed in 1.8.8
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 60× 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.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 05:43 UTCEG score recompute
  4. 2026-10-09 05:43 UTCVendor advisory
  5. 2026-10-08 17:13 UTCEPSS rescore
  6. 2026-10-08 09:12 UTCVendor advisory
  7. 2026-10-08 04:51 UTCEG score recompute
  8. 2026-10-08 04:51 UTCVendor advisory
  9. 2026-10-07 23:48 UTCEPSS rescore
  10. 2026-10-07 10:57 UTCVendor advisory
  11. 2026-10-07 06:36 UTCVendor advisory
  12. 2026-10-07 02:11 UTCVendor advisory
  13. 2026-10-06 16:49 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescore
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  21. 2026-10-02 20:59 UTCEG score recompute
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  24. 2026-09-30 20:25 UTCEG score recompute
  25. 2026-09-29 15:37 UTCEG score recompute
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  1. 2026-09-29 15:24 UTCEPSS rescore
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  5. 2026-09-27 16:24 UTCEG score recompute
  6. 2026-09-27 13:48 UTCEPSS rescore
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  8. 2026-09-26 15:59 UTCEPSS rescore
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  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-19 16:48 UTCEG score recompute
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  22. 2026-09-18 19:28 UTCEPSS rescore
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  25. 2026-09-16 14:08 UTCEPSS rescore
  26. 2026-09-16 09:35 UTCEG score recompute
  27. 2026-09-16 05:15 UTCEPSS rescore
  28. 2026-09-15 04:36 UTCEG score recompute
  29. 2026-09-15 03:12 UTCEPSS rescore
  30. 2026-09-13 17:45 UTCEG score recompute
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  32. 2026-09-12 15:02 UTCEPSS rescore
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  34. 2026-09-11 14:53 UTCEPSS rescore
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  36. 2026-09-10 10:29 UTCEG score recompute
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  38. 2026-09-09 01:44 UTCEG score recompute
  39. 2026-09-08 22:01 UTCEPSS rescore
  40. 2026-09-07 16:08 UTCEG score recompute
  41. 2026-09-06 18:00 UTCEG score recompute
  42. 2026-09-06 13:48 UTCEPSS rescore
  43. 2026-09-05 15:36 UTCEG score recompute
  44. 2026-09-04 17:32 UTCEG score recompute
  45. 2026-09-04 08:48 UTCEG score recompute
  46. 2026-09-04 05:07 UTCEPSS rescore
  47. 2026-09-02 15:11 UTCEG score recompute
  48. 2026-09-02 14:12 UTCEPSS rescore
  49. 2026-09-01 17:15 UTCEG score recompute
  50. 2026-09-01 13:54 UTCEPSS rescore
  51. 2026-09-01 08:27 UTCEG score recompute
  52. 2026-09-01 04:40 UTCEPSS rescore
  53. 2026-09-01 04:40 UTCEPSS rescore
  54. 2026-08-30 20:53 UTCEG score recompute
  55. 2026-08-30 19:18 UTCEPSS rescore
  56. 2026-08-30 19:17 UTCEPSS rescore
  57. 2026-08-30 03:26 UTCEG score recompute
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  60. 2026-08-28 21:42 UTCEPSS rescore
  61. 2026-08-27 16:09 UTCEG score recompute
  62. 2026-08-27 14:25 UTCEPSS rescore
  63. 2026-08-26 18:24 UTCEG score recompute
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  66. 2026-08-26 14:47 UTCEPSS rescore
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  74. 2026-08-21 21:24 UTCEG score recompute
  75. 2026-08-21 20:55 UTCEG score recompute

Related CVEs(same product + same vendor + 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 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-2026-77414 actively exploited?
CVE-2026-77414 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77414?
CVE-2026-77414 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77414?
A fix for CVE-2026-77414 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77414 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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