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CVE-2026-106104— Quasar Framework: Super-linear regex backtracking on User-Agent lets one request stall a Quasar SSR server

Quick assessment

Affected
quasarframework quasar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Quasar Framework 是一个用于构建高性能 Vue.js 用户界面的框架。在 2.23.3 版本之前，Platform.parseSSR() 会将一个未受限制的 User-Agent 请求头传递给 ui/src/plugins/platform/Platform.js 中的 getMatch() 函数。该函数的浏览器检测表达式结合使用贪婪捕获和重复的无界扫描。由于 Platform 属于自动安装的插件（autoInstalledPlugins），因此每次服务器端渲染（SSR）请求在路由之前都会执行此解析

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
quasarframework quasar < 2.23.3 affected
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I. Basic Information for CVE-2026-106104

Vulnerability Information
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Vulnerability Title
Quasar Framework: Super-linear regex backtracking on User-Agent lets one request stall a Quasar SSR server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
quasarframework quasar < 2.23.3 -

II. Public POCs for CVE-2026-106104

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III. Intelligence Information for CVE-2026-106104

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Other References for CVE-2026-106104 (3)

Same Patch Batch · quasarframework · 2026-10-06 · 8 CVEs total

CVE-2026-106102 10.0 CRITICAL Quasar Framework: Stored/Reflected XSS via unescaped SSR meta tag rendering in getHead()
CVE-2026-106105 8.4 HIGH Quasar Framework: Development TLS private keys are cached with overly permissive filesyste
CVE-2026-106107 8.3 HIGH Quasar Framework: App Vite SSR and SSG nonce attributes are not safely constrained
CVE-2026-106103 7.1 HIGH Quasar Framework: Path Traversal / Arbitrary File Write via crafted Icon Genie profile
CVE-2026-106106 7.1 HIGH Quasar Framework: SSR/SSG dev error page discloses the full shell environment and its </sc
CVE-2026-106109 4.1 MEDIUM Quasar Framework: App Vite build cleanup can recursively remove unsafe configured output d
CVE-2026-106101 3.1 LOW Quasar Framework: DOM Clobbering in Quasar openURL() SafariViewController Integration Caus

IV. Related Vulnerabilities

Same product: quasar
Same vendor: quasarframework
Same weakness: CWE-1333

V. Comments for CVE-2026-106104

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