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TI-2026-68624 Aliases CVE-2026-106104GHSA-68jq-fhch-4xq4

Regex backtracking on User-Agent header stalls Quasar SSR servers

Priority HIGH 79CWE-1333Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

Quasar Framework before 2.23.3 is affected. Its Platform.parseSSR() passes the unbounded User-Agent request header to regular expressions with super-linear backtracking (CWE-1333). An unauthenticated remote attacker can send one crafted request that blocks the Node.js event loop, delaying every other server-side rendering request.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix Fixed quasar (quasarframework): 2.23.3quasar (npm): 2.23.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
quasarframeworkquasarbefore 2.23.32.23.3Patch availableCNA
—quasar (npm)before 2.23.32.23.3Patch availableGHSA-68jq-fhch-4xq4
  • quasar Vendorquasarframework Affected before 2.23.3 Fixed in 2.23.3 Patch available CNA
  • quasar (npm) Vendor— Affected before 2.23.3 Fixed in 2.23.3 Patch available GHSA-68jq-fhch-4xq4

Remediation

Upgrade the quasar npm package to 2.23.3, the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA quasar (quasarframework) Fixed in 2.23.3
  • Fix · GHSA-68jq-fhch-4xq4 quasar (npm) Fixed in 2.23.3 Advisory →

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-106104
  2. 2026-10-07 Alias added: GHSA-68jq-fhch-4xq4
  3. 2026-10-07 Fix available: npm/[email protected] · GHSA-68jq-fhch-4xq4
  4. 2026-10-07 CVSS score added · GHSA-68jq-fhch-4xq4
  5. 2026-10-07 Weakness changed · GHSA-68jq-fhch-4xq4
  6. 2026-10-07 5 new references · GHSA-68jq-fhch-4xq4
  7. 2026-10-07 Priority changed: MEDIUM → LOW
  8. 2026-10-09 CISA SSVC decision points changed
  9. 2026-10-09 Priority changed: LOW → HIGH

References

Advisory 1

Other 4

  • TI-2026-68626 Quasar SSR dev error page leaks environment secrets and enables XSS CVSS 4.0HIGH 7.1
  • TI-2026-51731 Quasar Framework: Prototype pollution in Quasar extend() utility CVSS 3.1MEDIUM 5.6
  • TI-2026-68622 Cross-site scripting in Quasar Framework SSR meta tags CVSS 3.1CRITICAL 10.0
  • TI-2026-68621 Type confusion in quasarframework quasar CVSS 3.1LOW 3.1
  • TI-2026-68625 Quasar caches development TLS keys with lax file permissions CVSS 4.0HIGH 8.4
  • TI-2026-68627 Unsafe nonce interpolation in Quasar app-vite SSR and SSG output CVSS 4.0HIGH 8.3
See all 9 →

Sources

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