GHSA-c76h-2ccp-4975
First published: Tue Jan 21 2025(Updated: )
### Impact [Undici `fetch()` uses Math.random()](https://github.com/nodejs/undici/blob/8b06b8250907d92fead664b3368f1d2aa27c1f35/lib/web/fetch/body.js#L113) 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. ### Patches This is fixed in 5.28.5; 6.21.1; 7.2.3. ### Workarounds Do not issue multipart requests to attacker controlled servers. ### References * https://hackerone.com/reports/2913312 * https://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f
| Affected Software | Affected Version | How to fix |
|---|---|---|
| npm/undici | >=7.0.0<7.2.3 | 7.2.3 |
| npm/undici | >=6.0.0<6.21.1 | 6.21.1 |
| npm/undici | >=4.5.0<5.28.5 | 5.28.5 |
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Reference Links
- https://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975
- https://nvd.nist.gov/vuln/detail/CVE-2025-22150
- 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
- https://github.com/advisories/GHSA-c76h-2ccp-4975 (Advisory)
Frequently Asked Questions
What is the severity of GHSA-c76h-2ccp-4975?
GHSA-c76h-2ccp-4975 is considered to have a medium severity due to the predictability of the boundary used in multipart/form-data requests.
How do I fix GHSA-c76h-2ccp-4975?
To fix GHSA-c76h-2ccp-4975, update undici to version 7.2.3 or higher, 6.21.1 or higher, or 5.28.5 or higher.
Which versions of undici are affected by GHSA-c76h-2ccp-4975?
Versions of undici from 4.5.0 to 7.2.3 (inclusive) are affected by GHSA-c76h-2ccp-4975.
What kind of vulnerability is GHSA-c76h-2ccp-4975 associated with?
GHSA-c76h-2ccp-4975 is associated with a weak randomness implementation in the context of crafting multipart/form-data requests.
Is there a known exploit for GHSA-c76h-2ccp-4975?
As of now, there are no publicly known exploits specifically targeting GHSA-c76h-2ccp-4975.
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