High 8.7Published Oct 6, 2026

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

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects quasarframework quasar. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.29%, higher than 20% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.29% (percentile 20)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

quasarframework quasar quasarframework:quasar (from the name)	before 2.23.3	CNA record

References

https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4x-refsource-confirm
https://github.com/quasarframework/quasar/commit/7a954ddafa756afe95c8f633f48ed68a07209d3dx-refsource-misc
https://github.com/quasarframework/quasar/releases/tag/quasar-v2.23.3x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.