{"id":"CVE-2026-106104","state":"PUBLISHED","title":"Quasar Framework: Super-linear regex backtracking on User-Agent lets one request stall a Quasar SSR server","description":"Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.23.3, Platform.parseSSR() passed an unbounded User-Agent request header to getMatch() in ui/src/plugins/platform/Platform.js, whose browser-detection expressions combined greedy captures with repeated unbounded scans. Platform belongs to autoInstalledPlugins, so this parsing occurs before routing for every SSR request. A crafted unauthenticated request containing repeated version tokens without a terminating Safari token causes super-linear backtracking and blocks the Node.js event loop, delaying every other SSR request. SPA, PWA, Electron, Cordova, Capacitor, browser-extension, and static-site-generation targets are not affected because they do not parse an attacker-controlled request header through this path. This issue is fixed in version 2.23.3.","publishedAt":"2026-10-06T17:14:45.817Z","updatedAt":"2026-10-09T01:18:50.675Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["quasarframework quasar"],"affected":[{"vendor":"quasarframework","product":"quasar","versions":[{"version":"< 2.23.3","status":"affected"}]}],"references":["https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4","https://github.com/quasarframework/quasar/commit/7a954ddafa756afe95c8f633f48ed68a07209d3d","https://github.com/quasarframework/quasar/releases/tag/quasar-v2.23.3"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/106xxx/CVE-2026-106104.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-106104","state":"PUBLISHED","datePublished":"2026-10-06T17:14:45.817Z","dateUpdated":"2026-10-09T01:18:50.675Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-06T15:33:55.333Z"},"containers":{"cna":{"title":"Quasar Framework: Super-linear regex backtracking on User-Agent lets one request stall a Quasar SSR server","descriptions":[{"lang":"en","value":"Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.23.3, Platform.parseSSR() passed an unbounded User-Agent request header to getMatch() in ui/src/plugins/platform/Platform.js, whose browser-detection expressions combined greedy captures with repeated unbounded scans. Platform belongs to autoInstalledPlugins, so this parsing occurs before routing for every SSR request. A crafted unauthenticated request containing repeated version tokens without a terminating Safari token causes super-linear backtracking and blocks the Node.js event loop, delaying every other SSR request. SPA, PWA, Electron, Cordova, Capacitor, browser-extension, and static-site-generation targets are not affected because they do not parse an attacker-controlled request header through this path. This issue is fixed in version 2.23.3."}],"affected":[{"vendor":"quasarframework","product":"quasar","versions":[{"version":"< 2.23.3","status":"affected"}]}],"references":[{"url":"https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4","name":"https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/quasarframework/quasar/commit/7a954ddafa756afe95c8f633f48ed68a07209d3d","name":"https://github.com/quasarframework/quasar/commit/7a954ddafa756afe95c8f633f48ed68a07209d3d","tags":["x_refsource_MISC"]},{"url":"https://github.com/quasarframework/quasar/releases/tag/quasar-v2.23.3","name":"https://github.com/quasarframework/quasar/releases/tag/quasar-v2.23.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-06T17:14:45.817Z"},"source":{"advisory":"GHSA-68jq-fhch-4xq4","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-09T01:18:25.846526Z","id":"CVE-2026-106104","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-09T01:18:50.675Z"}}]}}}