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Advisory record · GHSA-68jq-fhch-4xq4

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

CVSS 8.7 HighEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 7 Oct 2026, 16:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
quasarnpm<2.23.32.23.3
Identifiers
GHSA-68jq-fhch-4xq4 · CVE-2026-106104
Weakness (CWE)
CWE-1333
Tags
Published
7 Oct 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Quasar Framework versions before 2.23.3 are vulnerable: its SSR server-side Platform plugin runs a regular expression with super-linear backtracking on the raw User-Agent header of each request. An unauthenticated attacker can send a crafted User-Agent to block the Node.js event loop, stalling the server for seconds per request and making the site unavailable to other visitors. Upgrade the quasar package to version 2.23.3 or later, which contains the fix.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.