CVE-2026-27971
Qwik vulnerable to Unauthenticated RCE via server$ Deserialization
EPSS 26.2%
Description
### Summary 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. ### Impact - Remote Code Execution
How to fix CVE-2026-27971
To remediate CVE-2026-27971, upgrade the affected package to a fixed version below.
- npm/@builder.io/qwik—upgrade to 1.19.1 or later
Is CVE-2026-27971 being exploited?
Moderate — EPSS is 26.2%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 1.19.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | 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 |