Vulnerability details
CVE-2026-45302
milamer parse-nested-form-data
Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names
CVSS 3.1
8.2High
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| milamer | parse-nested-form-data | < 1.0.1 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/milamer/parse-nested-form-data/commit/527ad58eb486e32438f7198fb88315c20449d792 x_refsource_MISC
- https://github.com/milamer/parse-nested-form-data/releases/tag/v1.0.1 x_refsource_MISC
- https://github.com/milamer/parse-nested-form-data/security/advisories/GHSA-xp7r-j8r6-j9h3 x_refsource_CONFIRM
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Details
- Published
- 2026-06-01
- Last updated
- 2026-06-02
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.31%
Probability of exploitation in 30 days
24.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')