#VU123517 Deserialization of Untrusted Data in Qwik - CVE-2026-27971

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Main Vulnerability Database Vulnerabilities #VU123517

#VU123517 Deserialization of Untrusted Data in Qwik - CVE-2026-27971

Published: March 4, 2026


Vulnerability identifier: #VU123517
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-27971
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Qwik
Software vendor:
Builder.io

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in the server$ RPC mechanism. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install updates from vendor's website.

External links