CVE-2026-1528

Name: CVE-2026-1528
Creator: NVD / NIST
Published: 2026-03-12T21:16:25.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-1528 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. Patches Patched in the undici version v7.24.0 and v6.24.0. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.34%

26.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nodejs	Undici	< 6.24.0
Nodejs	Undici	>= 7.0.0, < 7.24.0

References

https://cna.openjsf.org/security-advisories.htmlVendor Advisory
https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvjVendor Advisory
https://hackerone.com/reports/3537648Permissions Required

Timeline

Published: Mar 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-1528?

How severe is CVE-2026-1528?

CVE-2026-1528 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-1528?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-1528?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST