7.5

CVE-2026-12151

undici WebSocket client vulnerable to denial of service via fragment count bypass

Impact:
The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service.

Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds:
No workaround is available. The fix must be applied through an upgrade.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Nodejs ≫ Undici SwPlatformnode.js Version >= 6.17.0 < 6.27.0
Nodejs ≫ Undici SwPlatformnode.js Version >= 7.0.0 < 7.28.0
Nodejs ≫ Undici SwPlatformnode.js Version >= 8.0.0 < 8.5.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.76% 0.508
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
ce714d77-add3-4f53-aff5-83d477b104bb 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

https://cna.openjsf.org/security-advisories.html
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2489980
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12151.json
https://access.redhat.com/errata/RHSA-2026:35841
https://access.redhat.com/errata/RHSA-2026:35842
https://access.redhat.com/errata/RHSA-2026:35891
https://access.redhat.com/errata/RHSA-2026:35892
https://access.redhat.com/errata/RHSA-2026:34342
https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-12151
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/errata/RHSA-2026:36754