CVE-2026-45302

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 77% 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.

parse-nested-form-data is a tiny node module for parsing FormData by name into objects and arrays. Prior to version 1.0.1, parseFormData() walks bracket and dot-notation FormData field names into nested objects without filtering reserved property keys. A single FormData field whose name begins with __proto__, or contains .__proto__. mid-path, causes the parser to traverse onto Object.prototype and assign properties there, polluting the prototype chain of every plain object in the running process. This issue has been patched in version 1.0.1.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
23.4%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 2, 2026

Advisory Details (3)

Auto-updated Jun 2, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names · Advisory · milamer/parse-nested-form-data · GitHub

https://github.com/milamer/parse-nested-form-data/security/advisories/GHSA-xp7r-j8r6-j9h3
github_release Patch Available

v1.0.1

Patch available: milamer/parse-nested-form-data v1.0.1

https://github.com/milamer/parse-nested-form-data/releases/tag/v1.0.1
github_commit Patch Available

commit 527ad58eb486 (milamer/parse-nested-form-data)

Patch available: milamer/parse-nested-form-data v1.0.1 (contains commit 527ad58eb486)

https://github.com/milamer/parse-nested-form-data/commit/527ad58eb486e32438f7198fb88315c20449d792

Vendor Advisories for CVE-2026-45302(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
parse-nested-form-data—1.0.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 51× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-29 21:09 UTCEG score recompute
  13. 2026-06-28 14:07 UTCEPSS rescore
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  20. 2026-06-26 19:56 UTCEG score recompute
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  23. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  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
  7. 2026-06-19 19:25 UTCEPSS rescore
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  10. 2026-06-18 02:21 UTCEG score recompute
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  14. 2026-06-16 17:52 UTCEPSS rescore
  15. 2026-06-16 10:54 UTCEG score recompute
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  17. 2026-06-15 17:49 UTCEPSS rescore
  18. 2026-06-15 08:04 UTCEG score recompute
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  20. 2026-06-14 09:58 UTCEG score recompute
  21. 2026-06-13 23:00 UTCEPSS rescore
  22. 2026-06-13 22:52 UTCEG score recompute
  23. 2026-06-13 04:42 UTCEG score recompute
  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-12 23:12 UTCEPSS rescore
  26. 2026-06-12 17:39 UTCEG score recompute
  27. 2026-06-12 06:26 UTCEG score recompute
  28. 2026-06-11 19:23 UTCEG score recompute
  29. 2026-06-11 14:00 UTCEPSS rescore
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  35. 2026-06-10 10:14 UTCEG score recompute
  36. 2026-06-09 23:11 UTCEG score recompute
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  39. 2026-06-08 14:17 UTCEPSS rescore
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  41. 2026-06-08 14:02 UTCEG score recompute
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  43. 2026-06-07 15:57 UTCEG score recompute
  44. 2026-06-07 15:25 UTCEPSS rescore
  45. 2026-06-07 15:25 UTCEPSS rescore
  46. 2026-06-07 04:53 UTCEG score recompute
  47. 2026-06-06 17:51 UTCEG score recompute
  48. 2026-06-06 13:47 UTCEPSS rescore
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  50. 2026-06-06 06:48 UTCEG score recompute
  51. 2026-06-05 22:47 UTCEPSS rescore
  52. 2026-06-05 19:45 UTCEG score recompute
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  54. 2026-06-05 06:10 UTCEPSS rescore
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  56. 2026-06-04 21:39 UTCEG score recompute
  57. 2026-06-04 13:12 UTCEPSS rescore
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  59. 2026-06-04 10:36 UTCEG score recompute
  60. 2026-06-03 23:33 UTCEG score recompute
  61. 2026-06-03 12:30 UTCEG score recompute
  62. 2026-06-03 01:27 UTCEG score recompute
  63. 2026-06-02 20:13 UTCEPSS rescore
  64. 2026-06-02 14:24 UTCEG score recompute
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  66. 2026-06-01 16:18 UTCEG score recompute
  67. 2026-06-01 05:15 UTCEG score recompute
  68. 2026-05-24 06:17 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45302?
CVE-2026-45302 is a high vulnerability published on May 18, 2026. parse-nested-form-data is a tiny node module for parsing FormData by name into objects and arrays. Prior to version 1.0.1, parseFormData() walks bracket and dot-notation FormData field names into nested objects without filtering reserved property keys. A single FormData field whose name begins with…
When was CVE-2026-45302 disclosed?
CVE-2026-45302 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-2026-45302 actively exploited?
CVE-2026-45302 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45302?
CVE-2026-45302 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-45302?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45302, 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.

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