Formidable relies on hexoid to prevent guessing of filenames for untrusted executable content
Formidable (aka node-formidable) 2.x before 2.1.3 and 3.x before 3.5.3 relies on hexoid to prevent guessing of filenames for untrusted executable content; however, hexoid is documented as not "cryptographically secure." (Also, there is a scenario in which only the last two characters of a hexoid string need to be guessed, but this is not often relevant.) NOTE: this does not imply that, in a typical use case, attackers will be able to exploit any hexoid behavior to upload and execute their own content.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | formidable | >= 3.1.1-canary.20211030, < 3.5.3, >= 2.1.0, < 2.1.3 | 3.5.3, 2.1.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-46653
- https://github.com/node-formidable/formidable/commit/022c2c5577dfe14d2947f10909d81b03b6070bf5
- https://github.com/node-formidable/formidable/commit/37a3e89fca1ed68ec674a539f13aafd62221ddaa
- https://github.com/node-formidable/formidable
- https://github.com/node-formidable/formidable/blob/d0fbec13edc8add54a1afb9ce1a8d3db803f8d47/CHANGELOG.md?plain=1#L10
- https://github.com/zast-ai/vulnerability-reports/blob/main/formidable/file_upload/report.md
- https://www.npmjs.com/package/formidable/v/2.1.3
- https://www.npmjs.com/package/formidable/v/3.5.3
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-338- Platform
- npm
- Package
formidable- Disclosed
- 26.04.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-75v8-2h7p-7m2m - CC BY 4.0
Vulnerability history: formidable
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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