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CVE-2026-27971

CriticalPublished

Qwik affected by unauthenticated RCE via server$ Deserialization

Published: Mar 3, 2026
Updated: Mar 4, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 28, 2026

Primary CVSS

9.2/ 10Critical

nvd · CVSS 4.0

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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

5.4%

Low · next 30 days

Percentile: 92.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Qwik is a performance focused javascript framework. qwik <=1.19.0 is vulnerable to RCE due to an unsafe deserialization vulnerability in the server$ RPC mechanism that allows any unauthenticated user to execute arbitrary code on the server with a single HTTP request. Affects any deployment where require() is available at runtime. This vulnerability is fixed in 1.19.1.

Sources

CVE-2026-27971_POCPoC
CVE-2026-27971 qwik rce

Responsible use

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