How severe is CVE-2026-27971?

CVE-2026-27971 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27971 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27971?

CVE-2026-27971 affects Qwik. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27971?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-27971 have an EU (EUVD) identifier?

Yes. CVE-2026-27971 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9345.

When was CVE-2026-27971 published?

CVE-2026-27971 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-27971

CVE-2026-27971 is a critical-severity vulnerability in Qwik with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.2
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9345
Weakness: CWE-502
Affected product: Qwik
Published: 2026-03-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-27971?: CVE-2026-27971 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27971 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27971?: CVE-2026-27971 affects Qwik. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27971?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-27971 have an EU (EUVD) identifier?: Yes. CVE-2026-27971 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9345.
When was CVE-2026-27971 published?: CVE-2026-27971 was published on 2026-03-03 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:qwik:qwik:*:*:*:*:*:node.js:*:*

More vulnerabilities in Qwik

CVE-2023-1283 — Critical (CVSS 10.0): Code Injection in GitHub repository builderio/qwik prior to 0.21.0.
CVE-2026-25150 — Critical (CVSS 9.3): Qwik is a performance focused javascript framework. Prior to version 1.19.0, a prototype pollution vulnerability exists…
CVE-2026-32701 — High (CVSS 7.5): Qwik is a performance-focused JavaScript framework. Versions prior to 1.19.2 improperly inferred arrays from dotted…
CVE-2024-41677 — Medium (CVSS 6.3): Qwik is a performance focused javascript framework. A potential mutation XSS vulnerability exists in Qwik for versions…
CVE-2026-25149 — Medium (CVSS 6.1): Qwik is a performance focused javascript framework. Prior to version 1.19.0, an Open Redirect vulnerability in Qwik…
CVE-2026-25148 — Medium (CVSS 6.1): Qwik is a performance focused javascript framework. Prior to version 1.19.0, a Cross-Site Scripting vulnerability in…

All CVEs affecting Qwik →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →