CVE-2026-9675: undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-27

Last Updated

2026-08-12

EPSS Score

0.49% (percentile: 39.5%)

Affected Products (1)

Other

• 21370-17084

Revision History

• 2026-06-27: Information published.
• 2026-06-28: Information published.
• 2026-08-12: Information published.