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.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2025:1351 https://access.redhat.com/errata/RHSA-2025:1351
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:1443 https://access.redhat.com/errata/RHSA-2025:1443
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:1446 https://access.redhat.com/errata/RHSA-2025:1446
This issue has been addressed in the following products: Red Hat Developer Hub 1.3 on RHEL 9 Via RHSA-2025:1454 https://access.redhat.com/errata/RHSA-2025:1454
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2025:1582 https://access.redhat.com/errata/RHSA-2025:1582
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2025:1611 https://access.redhat.com/errata/RHSA-2025:1611
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:1613 https://access.redhat.com/errata/RHSA-2025:1613