CVE-2025-22150
Undici Uses Insufficiently Random Values
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.76% · top 44% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References (7)
- https://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/nodejs/undici/commit/711e20772764c29f6622ddc937c63b6eefdf07d0 (opens in a new tab)x_refsource_MISC
- https://github.com/nodejs/undici/commit/c2d78cd19fe4f4c621424491e26ce299e65e934a (opens in a new tab)x_refsource_MISC
- https://github.com/nodejs/undici/commit/c3acc6050b781b827d80c86cbbab34f14458d385 (opens in a new tab)x_refsource_MISC
- https://hackerone.com/reports/2913312 (opens in a new tab)x_refsource_MISC
- https://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f (opens in a new tab)x_refsource_MISC
- https://github.com/nodejs/undici/blob/8b06b8250907d92fead664b3368f1d2aa27c1f35/lib/web/fetch/body.js#L113 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-c76h-2ccp-4975 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-22150)Record last updated .