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CVE-2025-22150

Undici Uses Insufficiently Random Values

CVSS 3.1 6.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2025-22150

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2025-22150

Published

undici

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nodejs",
                    "product": "undici",
                    "versions": [
                        {
                            "version": ">= 4.5.0, < 5.28.5",
                            "status": "affected"
                        },
                        {
                            "version": ">= 6.0.0, < 6.21.1",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.0.0, < 7.2.3",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON