{"cve":"CVE-2026-84994","nvd":{"published":"2026-10-13T19:20:52.743","modified":"2026-10-14T17:19:46.043","status":"Awaiting Analysis","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-248"],"references":["https://github.com/QwikDev/qwik/commit/c1e7444402f9592b5cf9096e10bf303ab4640511","https://github.com/QwikDev/qwik/pull/8655","https://github.com/QwikDev/qwik/releases/tag/@builder.io/qwik@1.20.0","https://github.com/QwikDev/qwik/security/advisories/GHSA-x586-xvc8-g7q6"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:59:28.494260111+00:00"},"epss":{"cve":"CVE-2026-84994","score":0.00524,"percentile":0.44186,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-x586-xvc8-g7q6","url":"https://osv.dev/vulnerability/GHSA-x586-xvc8-g7q6","summary":"Qwik: Crashing any Qwik Server via Resource thenable","modified":"2026-10-15T20:30:03.950741495Z","packages":[{"ecosystem":"npm","name":"@builder.io/qwik","purl":"pkg:npm/%40builder.io/qwik","ranges":["<1.20.0"],"fixed":["1.20.0"]},{"ecosystem":"npm","name":"@qwik.dev/core","purl":"pkg:npm/%40qwik.dev/core","ranges":["<2.0.0-beta37"],"fixed":["2.0.0-beta37"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}