What is CVE-2026-1528?

CVE-2026-1528 is a high-severity vulnerability in Undici, classified under CWE-248. CVSS score: 7.5/10. Published 2026-03-12.

How severe is CVE-2026-1528?

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

Vulnerability in Undici

CVE-2026-1528

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process…

EPSS: 0.001 (30.5th percentile) — read the EPSS interpretation.

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 >= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0, 6.24.0: 7.24.0

Weakness classification (CWE)

CWE-248
CWE-1284 — Improper Validation of Specified Quantity in Input

References

github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
hackerone.com/reports/3537648
cna.openjsf.org/security-advisories.html

Frequently asked questions

What is CVE-2026-1528?: CVE-2026-1528 is a high-severity vulnerability in Undici, classified under CWE-248. CVSS score: 7.5/10. Published 2026-03-12.
How severe is CVE-2026-1528?: High severity. CVSS v3 base score is 7.5 out of 10.