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
CVSS v3
6.8
EPSS
0.0060
EPSS Percentile
69.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-330
Status
published
Products (4)
nodejs/undici
>= 4.5.0, < 5.28.5
nodejs/undici
>= 6.0.0, < 6.21.1
nodejs/undici
>= 7.0.0, < 7.2.3
npm/undici
4.5.0 - 5.28.5npm
Published
Jan 21, 2025
Tracked Since
Feb 18, 2026