Qwik affected by unauthenticated RCE via server$ Deserialization

What is CVE-2026-27971?

CVE-2026-27971 is a vulnerability classified as Deserialization of Untrusted Data, affecting qwik (affected versions: < 1.19.1). This vulnerability is rated Critical, with a CVSS score of 9.2. Current sources do not report this vulnerability as exploited.

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Overview

Original source data

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.

Affected products and scope

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Technical details

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Exploitability

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Technical impact

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Business impact

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Remediation

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Detection

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Sources (6)

GCVE / Vulnerability-Lookup

GitHub_M (CNA)

National Vulnerability Database (NVD)

Red Hat CSAF VEX

Other references

https://github.com/QwikDev/qwik/security/advisories/GHSA-p9x5-jp3h-96mm

Critical

CVSS score: 9.2
Equivalent IDs: GHSA-p9x5-jp3h-96mm
Provider: QwikDev
Primary affected product: qwik
Affected versions: < 1.19.1
Published: 03/03/2026
Exploitation status: Not known exploited
Estimated exploitation probability (EPSS): 5.42%
Remote initial access: Yes
Classification: CWE-502— Deserialization of Untrusted Data
Fix: Fix available

CVSS2

(Not available)

Attack complexity: —
Attack vector: —
Confidentiality impact: —
Integrity impact: —
Privileges required: —
User interaction required: —

CVSS3

(Not available)

Attack complexity: —
Attack vector: —
Confidentiality impact: —
Integrity impact: —
Privileges required: —
User interaction required: —

CVSS4

(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)

Attack complexity: Low
Attack vector: Network
Confidentiality impact: High
Integrity impact: High
Privileges required: None
User interaction required: None

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