What’s Vulnerable › Vulnerabilities

CVE-2025-46653

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-26 · updated 2026-06-17
• Weakness: CWE-338

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.

Affected products

• node-formidable Formidable: from 2.1.0 before 3.5.3 — fixed in 3.5.3

How to fix

Upgrade to a fixed version: node-formidable Formidable 3.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/node-formidable/formidable/blob/d0fbec13edc8add54a1afb9ce1a8d3db803f8d47/CHANGELOG.md?plain=1#L10
• https://github.com/node-formidable/formidable/commit/022c2c5577dfe14d2947f10909d81b03b6070bf5
• https://github.com/zast-ai/vulnerability-reports/blob/main/formidable/file_upload/report.md
• https://github.com/zast-ai/vulnerability-reports/blob/main/formidable/file_upload/report.md

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