CVE-2026-1528
undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 12, 2026
- Updated
- Sep 14, 2026
- Reserved
- Jan 28, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | openjs |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
undiciundici |
|
References
- https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
- https://hackerone.com/reports/3537648
- https://cna.openjsf.org/security-advisories.html
- https://access.redhat.com/security/cve/CVE-2026-1528vdb-entry
- RHBZ#2447145issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1528.json
- https://access.redhat.com/errata/RHSA-2026:17789vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7310vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7080vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7675vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7123vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7670vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7983vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7302vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7350vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:34342vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:9742vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13826vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:5807vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:21772vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:21931vendor-advisory
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