CVE-2026-33378 — Using the $__timeGroup macro, one can achieve an OOM by
CVE-2026-33378 — Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
What This Means For You
- If your environment is affected by this vulnerability type, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-33378 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Potential OOM via $__timeGroup macro abuse - CVE-2026-33378
title: Potential OOM via $__timeGroup macro abuse - CVE-2026-33378
id: scw-2026-05-13-ai-1
status: experimental
level: medium
description: |
Detects attempts to exploit CVE-2026-33378 by identifying web requests containing the '$__timeGroup(' string within the query parameters. This macro, when abused with a SQL datasource, can lead to an Out-of-Memory (OOM) condition on the server.
author: SCW Feed Engine (AI-generated)
date: 2026-05-13
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-33378/
tags:
- attack.impact
- attack.t1499
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '$__timeGroup('
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-33378 | vulnerability | CVE-2026-33378 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 13, 2026 at 23:16 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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