What is the CVSS score of CVE-2026-27971?

CVE-2026-27971 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 13.4%.

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

Qwik applications running version 1.19.0 or earlier face immediate risk of complete server compromise through remote code execution.. A patch is available.

Is there a public PoC exploit available for CVE-2026-27971?

Yes, a public proof-of-concept exploit is available for CVE-2026-27971. Prioritise patching immediately. EPSS: 13.4%.

How to fix or mitigate CVE-2026-27971?

Within 24 hours: Inventory all Qwik deployments and their versions; isolate affected systems from production if possible and implement emergency WAF rules to block server$ RPC calls. Within 7 days: Upgrade to Qwik 1.19.1 or later once available, or migrate to an alternative framework if no patch timeline is provided. Within 30 days: Conduct forensic analysis of logs for exploitation attempts; perform full security audit of affected systems; review and update incident response procedures.

Qwik CVE-2026-27971

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-03-03 security-advisories@github.com

GHSA-p9x5-jp3h-96mm

RCE Deserialization Qwik

9.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

PoC Detected

Mar 05, 2026 - 17:57 vuln.today

Public exploit code

CVE Published

Mar 03, 2026 - 23:15 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

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.