{"id":"CVE-2026-84994","aliases":["EUVD-2026-99978","GHSA-x586-xvc8-g7q6"],"status":"published","title":"Qwik: Crashing any Qwik Server via Resource thenable","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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00524,"percentile":0.4475,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-248"],"published":"2026-10-13T19:00:53Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"npm","package":"@builder.io/qwik","fixed_in":["1.20.0"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"@qwik.dev/core","fixed_in":["2.0.0-beta37"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@builder.io/qwik","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.0"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@qwik.dev/core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0-beta37"}]}]},{"source":"osv","ecosystem":"npm","package":"@builder.io/qwik","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.20.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@qwik.dev/core","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.0.0-beta37"}]}]}],"products":[{"vendor":"@builder.io","product":"qwik"},{"vendor":"qwikdev","product":"qwik"}],"references":[{"url":"https://github.com/QwikDev/qwik/security/advisories/GHSA-x586-xvc8-g7q6","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/QwikDev/qwik/pull/8655","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/QwikDev/qwik/commit/c1e7444402f9592b5cf9096e10bf303ab4640511","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/QwikDev/qwik/releases/tag/@builder.io/qwik@1.20.0","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84994","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-x586-xvc8-g7q6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84994.json","tags":["advisory"]},{"url":"https://github.com/QwikDev/qwik","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-84994","title":"Qwik: Crashing any Qwik Server via Resource thenable","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.","status":"published","published":"2026-10-13T19:00:53.742Z","modified":"2026-10-14T16:36:19.123Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T14:20:08.391556Z"}],"euvd":[{"id":"EUVD-2026-99978","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.","status":"published","published":"2026-10-13T19:00:53Z","modified":"2026-10-14T16:36:19Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T17:27:14.304159Z"}],"ghsa":[{"id":"GHSA-x586-xvc8-g7q6","title":"Qwik: Crashing any Qwik Server via Resource thenable","description":"### Summary\n\nA 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.\n\n### Impact\n\nOne unauthenticated request crashes the server. Looping keeps every replica dead as long as the attacker sends requests.","status":"published","published":"2026-10-15T20:22:00Z","modified":"2026-10-15T20:22:02Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T14:41:32.483482Z"}],"nvd":[{"id":"CVE-2026-84994","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.","status":"published","published":"2026-10-13T19:20:52.743Z","modified":"2026-10-14T17:19:46.043Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T14:12:58.13117Z"}],"osv":[{"id":"CVE-2026-84994","title":"Qwik: Crashing any Qwik Server via Resource thenable","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.","status":"published","published":"2026-10-13T19:00:53.742Z","modified":"2026-10-28T02:31:02.472638017Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T15:45:18.482949Z"},{"id":"GHSA-x586-xvc8-g7q6","title":"Qwik: Crashing any Qwik Server via Resource thenable","description":"### Summary\n\nA 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.\n\n### Impact\n\nOne unauthenticated request crashes the server. Looping keeps every replica dead as long as the attacker sends requests.","status":"published","published":"2026-10-15T20:22:00Z","modified":"2026-10-15T20:30:03.950741495Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T15:46:59.484835Z"}]}}