Vulnerability Report

CVE-2026-27971

RCE

Title: RCE in Qwik via Unsafe Deserialization

RCE

Proof Of Concept

PoC Available for CVE-2026-27971

CWE Category CWE-502

Published Date Mar 03, 2026

Modified Date Mar 05, 2026

Exploit Status Available

Score 9.2 CVSS v4.0

Exploit Probability (EPSS)

5.42%

Vulnerability Summary

CVE-2026-27971: 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.

Impacted Vendors

builder 1

qwik 1

Reference Links

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

CVSS v4.0

Source Entity [email protected]

Severity CRITICAL

9.2

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

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

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-27971 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/Ghalendar/CVE-2026-27971_POC

View Code

March 05, 2026 MODIFIED

Vulnerability data updated via NVD.

March 05, 2026 MODIFIED

Vulnerability data updated via NVD.

March 04, 2026 MODIFIED

Vulnerability data updated via NVD.

March 03, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    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

Affected Stack

No specific products linked.