CVE Intelligence
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CVE-2026-27971: Qwik: unauthenticated RCE via unsafe deserialization in server$

The Qwik JavaScript framework is affected by an unsafe deserialization flaw (CWE-502) in its server$ RPC mechanism, which the record says allows an unauthenticated user to execute arbitrary code on the server with one HTTP request. The record describes versions up to and including 1.19.0 as vulnerable and 1.19.1 as fixed. No confirmed exploitation appears in the sources consulted.

Published Oct 24, 2026 · Updated Oct 24, 2026 · Ler em português

Overview

The record describes an unsafe deserialization flaw (CWE-502) in the server$ RPC mechanism of the Qwik JavaScript framework. According to the description, versions up to and including 1.19.0 are affected and 1.19.1 contains the fix.

Impact

  • The record states that an unauthenticated user can execute arbitrary code on the server with a single HTTP request.
  • NVD assigns a CVSS base score of 9.8 (Critical), with high confidentiality, integrity and availability impact according to the vector.
  • GitHub's CNA score is 9.2 (Critical).
  • The record states that any deployment where require() is available at runtime is affected.

Affected products and versions

  • Qwik, listed in the record under two product names (Qwik Qwik and QwikDev Qwik): before 1.19.1, which per the description means versions up to and including 1.19.0.
  • The record's fixes list is empty. The fixed version 1.19.1 comes only from the description text.

Exploitation status

  • The record shows this CVE is not listed in the CISA KEV catalog. No confirmed exploitation in the wild appears in the sources consulted.
  • SSVC fields in the record show exploitation as none and automatable as no. The EPSS probability is 0.02948 with a percentile of 0.87072.

Remediation and mitigation

  • Upgrade Qwik to 1.19.1 or later.
  • If an immediate upgrade is not possible, review the vendor advisory for any interim measures. The record does not list workarounds.
  • Inventory applications that use Qwik, including server-side deployments, to identify exposure.

Detection guidance

  • Review web server and application logs for unusual requests to server RPC endpoints, at a high level.
  • Monitor for unexpected process activity or file changes originating from the application runtime.

Limitations of the available information

  • The record does not include technical details of the vulnerable code path, the specific endpoints involved, or indicators of compromise.
  • The fixes field is empty, so the fixed version is drawn only from the description.
  • Affected entries are written as '< 1.19.1' and 'version < 1.19.1' without a lower bound.

Frequently asked questions

Which Qwik versions are affected by CVE-2026-27971?

According to the record's description, Qwik versions up to and including 1.19.0 are affected. The fixed version is 1.19.1.

Is this vulnerability known to be exploited in the wild?

The record shows it is not listed in the CISA KEV catalog, and no confirmed exploitation appears in the sources consulted.

What should administrators do first?

Upgrade Qwik to 1.19.1 or later, and inventory applications that use Qwik, especially server-side deployments.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.