Uncaught Exception in undici - CVE-2026-19534

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Main Vulnerability Database Vulnerabilities #VU147180

Uncaught Exception in undici - CVE-2026-19534

Published: September 6, 2026


Vulnerability identifier: #VU147180
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-2026-19534
CWE-ID: CWE-248
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 an uncaught exception in the undici WebSocket client opening handshake when processing a server response containing an unrequested Sec-WebSocket-Protocol header. A remote attacker can send a crafted WebSocket handshake response to cause a denial of service.

Exploitation requires an application to open a WebSocket connection to an attacker-controlled or compromised server, or to use a plaintext ws:// connection subject to a machine-in-the-middle.


Affected software

undici
Automation Assets in IBM Cloud Pak for Integration (CP4I)
Platform Navigator in IBM Cloud Pak for Integration (CP4I)

How to mitigate CVE-2026-19534

Install security update from vendor's website.

undici - addressed in versions 6.28.1, 7.29.1, 8.10.2
Automation Assets in IBM Cloud Pak for Integration (CP4I) - addressed in versions 4.0.26-sc2, 4.4.3
Platform Navigator in IBM Cloud Pak for Integration (CP4I) - addressed in versions 16.1.0.29, 16.2.0.4

External References

Related Security Bulletins