# CVE-2026-1528

## Summary

- **CVE ID:** CVE-2026-1528
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-248, CWE-1284
- **Published:** Mar 12, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- undici — undici (>= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0)
- undici — undici (6.24.0: 7.24.0)

## References

- [CNA](https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj)
- [CNA](https://hackerone.com/reports/3537648)
- [CNA](https://cna.openjsf.org/security-advisories.html)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-1528)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2447145)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1528.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:17789)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7310)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7080)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7675)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7123)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7670)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7983)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7302)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:7350)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:9742)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:13826)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:5807)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:21772)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:21931)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:34342)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.49%
- **EPSS Percentile:** 40.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._