Resource exhaustion in undici - CVE-2026-9675
Published: June 17, 2026
Vulnerability identifier: #VU134757
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-9675
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the WebSocket client when processing fragmented uncompressed messages. A remote attacker can stream many small WebSocket fragments to cause a denial of service.
Exploitation requires an application using the WebSocket client to connect to an attacker-controlled or compromised WebSocket endpoint.
Affected software
undici
DataStage on Cloud Pak for Data
DataStage on Cloud Pak for Data
How to mitigate CVE-2026-9675
Install security update from vendor's website.
undici - update to 8.5.0
DataStage on Cloud Pak for Data - addressed in versions 5.3.1 patch 11, 5.4 patch 5
DataStage on Cloud Pak for Data - addressed in versions 5.3.1 patch 11, 5.4 patch 5