Vulnerability · CVE-2026-84994
Qwik is a performance-focused JavaScript framework.
Published Oct 13, 2026 · catalog updated Oct 15, 2026 · QwikDev
Check if you run it
No confirmed exploitation is on record for CVE-2026-84994. EPSS is 0.52%. Act only if a listed version of QwikDev is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.52%
- Remediation
- Version ranges on file
- Affected products
- npm @builder.io · npm @builder.io/qwik · npm @qwik.dev · npm @qwik.dev/core · vendor @builder.io qwik · vendor QwikDev qwik
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistered symbol, causing an orphaned asynchronous rejection that terminates Node.js under its default unhandled-rejection policy. A single request can crash a server, and repeated requests can keep replicas unavailable. This issue is fixed in @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- npm @builder.ioversion unspecified
- npm @builder.io/qwik0 → 1.20.0
- npm @builder.io/qwik< 1.20.0
- npm @qwik.devversion unspecified
- npm @qwik.dev/core0 → 2.0.0-beta37
- npm @qwik.dev/core< 2.0.0-beta37
- vendor @builder.io qwikversion unspecified
- vendor QwikDev qwikversion unspecified
How to fix CVE-2026-84994
Recommended remediation
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-84994. EPSS is 0.52%. Act only if a listed version of QwikDev is installed.
Which versions are affected?
Compare what you have installed with 0 → 1.20.0, < 1.20.0, 0 → 2.0.0-beta37, < 2.0.0-beta37. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-248. EPSS 0.52%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · NIST NVD
Detected
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistere
Oct 14, 2026 · NIST NVD
Updated
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistere
Oct 15, 2026 · GitHub Advisory Database
Fix available
@builder.io/qwik fixed in 1.20.0; @qwik.dev/core fixed in 2.0.0-beta37
Oct 15, 2026 · GitHub Advisory Database
Fix available
@builder.io/qwik fixed in 1.20.0
Oct 15, 2026 · GitHub Advisory Database
Fix available
@qwik.dev/core fixed in 2.0.0-beta37
Oct 15, 2026 · GitHub Advisory Database
Updated
### Summary A Qwik server in the default configuration can be crashed with one unauthenticated HTTP request. During qwik-json body parsing, does . If is a plain object whose is a QRL for an unregistered symbol, the async QRL rejects, the rejection is orphaned, and Node terminates the process via its default unhandled-rejection policy. ### Impact One unauthenticated request crashes the server. Loop
Sources
- CIRCL Vulnerability LookupVulnerability recordCVE-2026-84994
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-con
vulnerability.circl.lu - CVE.orgVulnerability recordCVE-2026-84994
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-84994
30-day exploitation probability 0.5%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-x586-xvc8-g7q6
Qwik: Crashing any Qwik Server via Resource thenable
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-84994
A Qwik server in the default configuration can be crashed with one unauthenticated HTTP request. During qwik-json body parsing, ResourceSerializer.$fill$ does Promise.resolve(resource._resolved). If _resolved is a plain object whose .then is a QRL for an unregistered symbol, the async QRL rejects, the rejection is orphaned, and Node terminates the process via its default unhandled-rejection policy
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-84994
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-con
nvd.nist.gov - OpenSSF OSV / OSV ScannerPackage advisoryGHSA-x586-xvc8-g7q6
Qwik: Crashing any Qwik Server via Resource thenable
osv.dev
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.