What is CVE-2026-12151?

CVE-2026-12151 is a high-severity vulnerability in Undici, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-17.

How severe is CVE-2026-12151?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Undici

CVE-2026-12151

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 continu…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Undici — versions 0, 6.26.0, 7.0.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption
CWE-770 — Allocation of Resources Without Limits or Throttling

References

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ce714d77-add3-4f53-aff5-83d477b104bb

Frequently asked questions

What is CVE-2026-12151?: CVE-2026-12151 is a high-severity vulnerability in Undici, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-17.
How severe is CVE-2026-12151?: High severity. CVSS v3 base score is 7.5 out of 10.