GHSA-c76h-2ccp-4975
Use of Insufficiently Random Values in undici
Details
### 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
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975 [WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-22150 [ADVISORY]
- https://github.com/nodejs/undici/commit/711e20772764c29f6622ddc937c63b6eefdf07d0 [WEB]
- https://github.com/nodejs/undici/commit/c2d78cd19fe4f4c621424491e26ce299e65e934a [WEB]
- https://github.com/nodejs/undici/commit/c3acc6050b781b827d80c86cbbab34f14458d385 [WEB]
- https://hackerone.com/reports/2913312 [WEB]
- https://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f [WEB]
- https://github.com/nodejs/undici [PACKAGE]
- https://github.com/nodejs/undici/blob/8b06b8250907d92fead664b3368f1d2aa27c1f35/lib/web/fetch/body.js#L113 [WEB]