CVE-2025-22150 (CVSS 6.8)

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.

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CVSS v3.1 Score

6.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-330 CWE-330

References

Other References

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/nodejs/undici/commit/711e20772764c29f6622ddc937c63b6eefdf07d0 https://github.com/nodejs/undici/commit/c2d78cd19fe4f4c621424491e26ce299e65e934a https://github.com/nodejs/undici/commit/c3acc6050b781b827d80c86cbbab34f14458d385 https://github.com/nodejs/undici/security/advisories/GHSA-c76h-2ccp-4975 https://hackerone.com/reports/2913312

Frequently Asked Questions

What is CVE-2025-22150? +

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. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2025-22150? +

CVE-2025-22150 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-22150? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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