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TI-2026-72686 Aliases CVE-2026-84994GHSA-x586-xvc8-g7q6

Qwik server crash via attacker-supplied Resource thenable

Priority MEDIUM 44CWE-248Published · 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-248.

Summary

The Qwik JavaScript framework is affected in @builder.io/qwik before 1.20.0 and @qwik.dev/core before 2.0.0-beta37. Default server-side qwik-json deserialization passes an attacker-controlled thenable to Promise.resolve without rejecting it first, which is an uncaught exception (CWE-248). An unauthenticated remote attacker can send one request that leads to an unhandled rejection and terminates a Node.js server under its default policy. Repeated requests can keep server replicas unavailable.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistered symbol, causing an orphaned asynchronous rejection that terminates Node.js under its default unhandled-rejection policy. A single request can crash a server, and repeated requests can keep replicas unavailable. This issue is fixed in @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00524 44th percentileScored 2026-11-07
Fix Fixed qwik (QwikDev): 2.0.0-beta37qwik (@builder.io): 1.20.0+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
QwikDevqwikbefore 2.0.0-beta372.0.0-beta37Patch availableCNA
@builder.ioqwikbefore 1.20.01.20.0Patch availableCNA
—@builder.io/qwik (npm)before 1.20.01.20.0Patch availableGHSA-x586-xvc8-g7q6
—@qwik.dev/core (npm)before 2.0.0-beta372.0.0-beta37Patch availableGHSA-x586-xvc8-g7q6
  • qwik VendorQwikDev Affected before 2.0.0-beta37 Fixed in 2.0.0-beta37 Patch available CNA
  • qwik Vendor@builder.io Affected before 1.20.0 Fixed in 1.20.0 Patch available CNA
  • @builder.io/qwik (npm) Vendor— Affected before 1.20.0 Fixed in 1.20.0 Patch available GHSA-x586-xvc8-g7q6
  • @qwik.dev/core (npm) Vendor— Affected before 2.0.0-beta37 Fixed in 2.0.0-beta37 Patch available GHSA-x586-xvc8-g7q6

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:qwik:qwik:*:*:*:*:*:*:*:*——QwikDev
  • cpe:2.3:a:qwik:qwik:*:*:*:*:*:*:*:* Versions — — ·QwikDev

Remediation

Upgrade @builder.io/qwik to 1.20.0 or later and @qwik.dev/core to 2.0.0-beta37 or later. The sources list no fixed version for QwikDev qwik.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA qwik (QwikDev) Fixed in 2.0.0-beta37
  • Fix · CNA qwik (@builder.io) Fixed in 1.20.0
  • Fix · GHSA-x586-xvc8-g7q6 @builder.io/qwik (npm) Fixed in 1.20.0 Advisory →
  • Fix · GHSA-x586-xvc8-g7q6 @qwik.dev/core (npm) Fixed in 2.0.0-beta37 Advisory →

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-84994
  2. 2026-10-14 Priority changed: MEDIUM → LOW
  3. 2026-10-15 CISA SSVC decision points changed
  4. 2026-10-15 Priority changed: LOW → MEDIUM
  5. 2026-10-16 Alias added: GHSA-x586-xvc8-g7q6
  6. 2026-10-16 Fix available: npm/@builder.io/[email protected], npm/@qwik.dev/[email protected] · GHSA-x586-xvc8-g7q6
  7. 2026-10-16 CVSS score added · GHSA-x586-xvc8-g7q6
  8. 2026-10-16 Weakness changed · GHSA-x586-xvc8-g7q6
  9. 2026-10-16 6 new references · GHSA-x586-xvc8-g7q6

References

Advisory 1

Other 5

  • TI-2023-01211 Code Injection in builderio/qwik CVSS 3.1CRITICAL 10.0
  • TI-2026-56751 gpt-crawler Arbitrary File Write via outputFileName Parameter CVSS 4.0HIGH 8.8
  • TI-2025-33547 Crashing any Qwik Server CVSS 4.0CRITICAL 9.2
  • TI-2023-02164 Cross-Site Request Forgery (CSRF) in builderio/qwik CVSS 3.1MEDIUM 6.5
  • TI-2024-27738 Cross-site Scripting (XSS) vulnerability due to improper HTML escaping in qwik CVSS 3.1MEDIUM 6.3
  • TI-2023-00388 Cross-site Scripting (XSS) - Generic in builderio/qwik CVSS 3.1MEDIUM 6.1
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences