CVE-2026-8723 — ### Summary `qs.stringify` throws `TypeError` when
CVE-2026-8723 — ### Summary `qs.stringify` throws `TypeError` when called with `arrayFormat: 'comma'` and `encodeValuesOnly: true` on an array containing `null` or `undefined`. The throw is synchronous and not handled by any of qs's null-related options (`skipNulls`, `strictNullHandling`). ###
What This Means For You
- If your environment is affected by CWE-476, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-8723 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Potential Exploit of qs.stringify TypeError Vulnerability (CVE-2026-8723)
title: Potential Exploit of qs.stringify TypeError Vulnerability (CVE-2026-8723)
id: scw-2026-05-17-ai-1
status: experimental
level: medium
description: |
This rule detects attempts to exploit CVE-2026-8723 by looking for the specific query string parameters 'arrayFormat=comma&encodeValuesOnly=true' which are necessary to trigger the TypeError in the qs.stringify function when encountering null or undefined array elements. This indicates a potential attempt to crash an application using a vulnerable version of the 'qs' library.
author: SCW Feed Engine (AI-generated)
date: 2026-05-17
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-8723/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'arrayFormat=comma&encodeValuesOnly=true'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-8723 | vulnerability | CVE-2026-8723 |
| CWE-476 | weakness | CWE-476 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 17, 2026 at 03:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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