CVE-2026-77413

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: 0.7% (52nd 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: 0.7%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 2.2.0, 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.

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
0.7%
EPSS %ILE
52nd
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 (6)

Auto-updated Oct 3, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
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-8gq3-vp5j-2grp
github_release Patch Available

2.2.0 Milestone Release

Patch available: jsonata-js/jsonata v2.2.0

https://github.com/jsonata-js/jsonata/releases/tag/v2.2.0
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 $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/794
github_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/4c5f4adfb90a9b500889d50f90050ca68888b50d
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

Vendor Advisories for CVE-2026-77413(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—
  • every version up to 1.8.8: fixed in 1.8.8
  • 2.0.0 up to 2.2.0: fixed in 2.2.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 05:45 UTCEG score recompute
  4. 2026-10-09 05:45 UTCVendor advisory
  5. 2026-10-08 17:13 UTCEPSS rescore
  6. 2026-10-08 08:54 UTCVendor advisory
  7. 2026-10-08 04:52 UTCEG score recompute
  8. 2026-10-08 04:52 UTCVendor advisory
  9. 2026-10-07 23:48 UTCEPSS rescore
  10. 2026-10-07 09:59 UTCVendor advisory
  11. 2026-10-07 05:22 UTCVendor advisory
  12. 2026-10-07 01:20 UTCVendor advisory
  13. 2026-10-06 16:49 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescore
  15. 2026-10-05 17:52 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescore
  17. 2026-10-05 01:31 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescore
  19. 2026-10-03 16:41 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescore
  21. 2026-10-02 19:09 UTCEG score recompute
  22. 2026-10-01 21:24 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescore
  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
  2. 2026-09-28 21:35 UTCEG score recompute
  3. 2026-09-28 13:52 UTCEPSS rescore
  4. 2026-09-27 15:47 UTCEG score recompute
  5. 2026-09-27 13:48 UTCEPSS rescore
  6. 2026-09-27 02:25 UTCEG score recompute
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 00:28 UTCEPSS rescore
  9. 2026-09-24 16:12 UTCEG score recompute
  10. 2026-09-24 14:04 UTCEPSS rescore
  11. 2026-09-23 20:01 UTCEG score recompute
  12. 2026-09-23 17:54 UTCEPSS rescore
  13. 2026-09-22 19:42 UTCEG score recompute
  14. 2026-09-22 16:01 UTCEPSS rescore
  15. 2026-09-21 22:06 UTCEG score recompute
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-20 21:50 UTCEG score recompute
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-19 18:23 UTCEG score recompute
  20. 2026-09-18 21:37 UTCEG score recompute
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-17 21:16 UTCEG score recompute
  23. 2026-09-16 14:19 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 09:35 UTCEG score recompute
  26. 2026-09-16 05:15 UTCEPSS rescore
  27. 2026-09-15 03:48 UTCEG score recompute
  28. 2026-09-15 03:12 UTCEPSS rescore
  29. 2026-09-13 18:29 UTCEG score recompute
  30. 2026-09-12 18:17 UTCEG score recompute
  31. 2026-09-12 15:02 UTCEPSS rescore
  32. 2026-09-11 18:00 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescore
  34. 2026-09-11 09:54 UTCEG score recompute
  35. 2026-09-10 13:42 UTCEG score recompute
  36. 2026-09-10 09:35 UTCEPSS rescore
  37. 2026-09-09 01:45 UTCEG score recompute
  38. 2026-09-08 22:01 UTCEPSS rescore
  39. 2026-09-07 19:30 UTCEG score recompute
  40. 2026-09-06 16:18 UTCEG score recompute
  41. 2026-09-06 13:48 UTCEPSS rescore
  42. 2026-09-05 15:59 UTCEG score recompute
  43. 2026-09-04 15:16 UTCEG score recompute
  44. 2026-09-04 07:11 UTCEG score recompute
  45. 2026-09-04 05:07 UTCEPSS rescore
  46. 2026-09-02 15:11 UTCEG score recompute
  47. 2026-09-02 14:12 UTCEPSS rescore
  48. 2026-09-01 14:32 UTCEG score recompute
  49. 2026-09-01 13:54 UTCEPSS rescore
  50. 2026-09-01 06:21 UTCEG score recompute
  51. 2026-09-01 04:40 UTCEPSS rescore
  52. 2026-09-01 04:40 UTCEPSS rescore
  53. 2026-08-30 21:50 UTCEG score recompute
  54. 2026-08-30 19:18 UTCEPSS rescore
  55. 2026-08-30 19:17 UTCEPSS rescore
  56. 2026-08-30 01:40 UTCEG score recompute
  57. 2026-08-30 01:22 UTCEPSS rescore
  58. 2026-08-29 01:05 UTCEG score recompute
  59. 2026-08-28 21:42 UTCEPSS rescore
  60. 2026-08-27 18:18 UTCEG score recompute
  61. 2026-08-27 14:25 UTCEPSS rescore
  62. 2026-08-26 17:52 UTCEG score recompute
  63. 2026-08-26 14:47 UTCEPSS rescore
  64. 2026-08-25 16:37 UTCEG score recompute
  65. 2026-08-25 13:49 UTCEPSS rescore
  66. 2026-08-24 20:27 UTCEG score recompute
  67. 2026-08-24 19:51 UTCEG score recompute
  68. 2026-08-24 18:02 UTCEG score recompute
  69. 2026-08-24 14:18 UTCEPSS rescore
  70. 2026-08-24 09:58 UTCEG score recompute
  71. 2026-08-23 01:37 UTCEG score recompute
  72. 2026-08-23 00:19 UTCEPSS rescore
  73. 2026-08-21 21:24 UTCEG score recompute
  74. 2026-08-21 20:55 UTCEG score recompute
  75. 2026-08-21 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

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 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-2026-77413 actively exploited?
CVE-2026-77413 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77413?
CVE-2026-77413 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-2026-77413?
A fix for CVE-2026-77413 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77413 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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