CVE-2025-22150
MEDIUM6.8EPSS 0.60%Use of Insufficiently Random Values in undici
Description
### 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 packages (3)
- Alpine/nodejsfrom 0, < 22.13.1-r0
- Debian/node-undicifrom 0
- npm/undici>= 4.5.0, < 5.28.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
References (11)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-22150
- ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2025-22150
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-22150
- PATCHhttps://github.com/nodejs/undici
- WEBhttps://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f
- WEBhttps://github.com/nodejs/undici/blob/8b06b8250907d92fead664b3368f1d2aa27c1f35/lib/web/fetch/body.js#L113
- WEBhttps://github.com/nodejs/undici/commit/711e20772764c29f6622ddc937c63b6eefdf07d0
- WEBhttps://github.com/nodejs/undici/commit/c2d78cd19fe4f4c621424491e26ce299e65e934a
- WEBhttps://github.com/nodejs/undici/commit/c3acc6050b781b827d80c86cbbab34f14458d385
- WEBhttps://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975
- WEBhttps://hackerone.com/reports/2913312