CVE-2026-46510

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% 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
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

form-data-objectizer converts FormData to object. Prior to 1.0.1, form-data-objectizer walks bracket-notation form keys (e.g. name[sub]) into nested objects without filtering __proto__, constructor, or prototype. A single HTTP form field whose name starts with __proto__[...] causes the library to mutate Object.prototype, which is a prototype pollution primitive of the entire Node.js process. This vulnerability is fixed in 1.0.1.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
20.0%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 2, 2026

Advisory Details (2)

Auto-updated Jun 3, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github Patch Available🟡 PoC Available

Prototype pollution in form-data-objectizer via bracket-notation form keys · Advisory · kaspernj/form-data-objectizer · GitHub

https://github.com/kaspernj/form-data-objectizer/security/advisories/GHSA-m2hg-wjq3-28wq
github_commit

commit 7c54b99408e6 (kaspernj/form-data-objectizer)

Fix landed in kaspernj/form-data-objectizer commit 7c54b99408e6 — awaiting tagged release

https://github.com/kaspernj/form-data-objectizer/commit/7c54b99408e6e9cd6533b7245bf197dadc2a2dbc

Vendor Advisories for CVE-2026-46510(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
form-data-objectizer—1.0.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 55× 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. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-08 15:16 UTCEPSS rescore
  3. 2026-07-07 13:46 UTCEPSS rescore
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  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-29 21:10 UTCEG score recompute
  11. 2026-06-29 14:06 UTCEPSS rescore
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  13. 2026-06-28 14:07 UTCEPSS rescore
  14. 2026-06-28 08:46 UTCEG score recompute
  15. 2026-06-28 04:56 UTCEPSS rescore
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  17. 2026-06-27 21:23 UTCEG score recompute
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  20. 2026-06-26 19:57 UTCEG score recompute
  21. 2026-06-26 05:11 UTCEG score recompute
  22. 2026-06-25 17:48 UTCEG score recompute
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 14:05 UTCEPSS rescore
  25. 2026-06-23 21:33 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
  3. 2026-06-22 14:25 UTCEPSS rescore
  4. 2026-06-21 14:56 UTCEPSS rescore
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  6. 2026-06-21 01:59 UTCEPSS rescore
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  8. 2026-06-19 19:26 UTCEPSS rescore
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  10. 2026-06-18 17:52 UTCEPSS rescore
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  12. 2026-06-18 02:25 UTCEG score recompute
  13. 2026-06-17 17:53 UTCEPSS rescore
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  16. 2026-06-16 17:53 UTCEPSS rescore
  17. 2026-06-16 10:55 UTCEG score recompute
  18. 2026-06-15 23:14 UTCEG score recompute
  19. 2026-06-15 17:49 UTCEPSS rescore
  20. 2026-06-14 21:44 UTCEG score recompute
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  22. 2026-06-13 23:00 UTCEPSS rescore
  23. 2026-06-13 22:56 UTCEG score recompute
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  25. 2026-06-12 23:12 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 16:05 UTCEG score recompute
  28. 2026-06-12 04:13 UTCEG score recompute
  29. 2026-06-11 16:48 UTCEG score recompute
  30. 2026-06-11 14:00 UTCEPSS rescore
  31. 2026-06-11 04:37 UTCEG score recompute
  32. 2026-06-10 22:18 UTCEPSS rescore
  33. 2026-06-10 17:13 UTCEG score recompute
  34. 2026-06-10 13:22 UTCEPSS rescore
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  36. 2026-06-10 05:49 UTCEG score recompute
  37. 2026-06-09 18:26 UTCEG score recompute
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  39. 2026-06-08 19:39 UTCEG score recompute
  40. 2026-06-08 14:17 UTCEPSS rescore
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  42. 2026-06-08 08:02 UTCEG score recompute
  43. 2026-06-07 20:40 UTCEG score recompute
  44. 2026-06-07 15:25 UTCEPSS rescore
  45. 2026-06-07 15:25 UTCEPSS rescore
  46. 2026-06-07 09:17 UTCEG score recompute
  47. 2026-06-06 21:54 UTCEG score recompute
  48. 2026-06-06 13:47 UTCEPSS rescore
  49. 2026-06-06 13:47 UTCEPSS rescore
  50. 2026-06-06 10:30 UTCEG score recompute
  51. 2026-06-05 23:07 UTCEG score recompute
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  54. 2026-06-05 06:10 UTCEPSS rescore
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  57. 2026-06-04 13:12 UTCEPSS rescore
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  59. 2026-06-04 12:58 UTCEG score recompute
  60. 2026-06-04 01:35 UTCEG score recompute
  61. 2026-06-03 14:12 UTCEG score recompute
  62. 2026-06-03 02:49 UTCEG score recompute
  63. 2026-06-02 20:13 UTCEPSS rescore
  64. 2026-06-02 15:26 UTCEG score recompute
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  66. 2026-06-01 16:40 UTCEG score recompute
  67. 2026-06-01 13:52 UTCEPSS rescore
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  69. 2026-06-01 05:17 UTCEG score recompute
  70. 2026-05-31 22:30 UTCEPSS rescore
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  72. 2026-05-31 00:16 UTCEPSS rescore
  73. 2026-05-31 00:16 UTCEPSS rescore
  74. 2026-05-24 06:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-46510?
CVE-2026-46510 is a high vulnerability published on May 18, 2026. form-data-objectizer converts FormData to object. Prior to 1.0.1, form-data-objectizer walks bracket-notation form keys (e.g. name[sub]) into nested objects without filtering proto, constructor, or prototype. A single HTTP form field whose name starts with proto[...] causes the library to mutate…
When was CVE-2026-46510 disclosed?
CVE-2026-46510 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46510 actively exploited?
CVE-2026-46510 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46510?
CVE-2026-46510 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-46510?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46510, 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

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