CVE-2025-46653: formidable Weak RNG — Exploit & Fix

Description

Formidable (aka node-formidable) 2.1.0 through 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.

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CVSS v3.1 Score

3.1

LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-338 CWE-338

Affected Products

Vendor	Product	Versions
node-formidable	formidable	2.1.0 — 3.5.3

References

Frequently Asked Questions

What is CVE-2025-46653? +

Formidable (aka node-formidable) 2.1.0 through 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. It has a CVSS v3.1 base score of 3.1 (LOW).

How severe is CVE-2025-46653? +

CVE-2025-46653 has a CVSS v3.1 score of 3.1 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-46653? +

CVE-2025-46653 affects products from node-formidable, specifically: formidable. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46653? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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