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.

Classification

CVE ID: CVE-2025-22150

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.8

Affected Products

Vendor: nodejs

Product: undici

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 12.61% (scored less or equal to compared to others)

EPSS Date: 2025-02-19 (when was this score calculated)

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

Timeline