CVE-2026-27971: Qwik is a performance focused javascript framework

Q: How urgent is CVE-2026-27971?

Priority 62/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-27971 is a critical-severity flaw (CVSS 9.8) affecting qwik. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.5% (top 7%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-03-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: qwik

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-03 23:15 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

qwik qwik UPGRADE

Affected: < 1.19.1

Fixed in: 1.19.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls qwik

2. UPGRADE to 1.19.1

npm install qwik@">=1.19.1"

Exact fixes by distribution

npm · @builder.io/qwik · FIXED · 1.19.1 · vulnerable: <= 1.19.0 · source

npm install @builder.io/qwik@">=1.19.1" npm ls @builder.io/qwik

Fedora 46 · python-hatchling · FIXED · 1.33.0-1.fc46 · FEDORA-2026-3ccbf17812 · source

sudo dnf upgrade --advisory=FEDORA-2026-3ccbf17812

Fedora ELN · pie · FIXED · 1.5.3-1.eln159 · FEDORA-2026-e009523caa · source

sudo dnf upgrade --advisory=FEDORA-2026-e009523caa

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Ghalendar/CVE-2026-27971_POC (0 stars)
Nuclei scan template: Qwik - Unauthenticated RCE via server$ Deserialization

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27971?

qwik: upgrade to 1.19.1. Exact commands for each OS are on this page.

Is CVE-2026-27971 being exploited?

CVE-2026-27971 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27971 affect?

CVE-2026-27971 affects qwik. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-27971?

Priority 62/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-32701 HIGH 7.5 UPGRADE Qwik is a performance-focused JavaScript framework
CVE-2026-25155 MEDIUM 5.9 UPGRADE Qwik is a performance focused javascript framework
CVE-2026-25151 MEDIUM 5.9 UPGRADE Qwik is a performance focused javascript framework
CVE-2026-25150 CRITICAL 9.3 UPGRADE Qwik is a performance focused javascript framework
CVE-2026-25149 MEDIUM 6.1 UPGRADE Qwik is a performance focused javascript framework

References

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