CVE-2026-6994 — A weakness has been identified in Envoy up to 1.33.0.
CVE-2026-6994 — A weakness has been identified in Envoy up to 1.33.0. Affected is the function params.add of the file source/extensions/filters/http/header_mutation/header_mutation.cc of the component Query Parameter Handler. This manipulation causes injection. Remote exploitation of the attack is p
What This Means For You
- If your environment is affected by CWE-74, CWE-707, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-6994 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.
Envoy Header Mutation Query Parameter Injection - CVE-2026-6994
title: Envoy Header Mutation Query Parameter Injection - CVE-2026-6994
id: scw-2026-04-25-ai-1
status: experimental
level: high
description: |
Detects potential exploitation of CVE-2026-6994 in Envoy by looking for the specific function call 'params.add(' within the query string of web requests. This vulnerability allows for injection attacks through the Query Parameter Handler component.
author: SCW Feed Engine (AI-generated)
date: 2026-04-25
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-6994/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'params.add('
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-6994 | vulnerability | CVE-2026-6994 |
| CWE-74 | weakness | CWE-74 |
| CWE-707 | weakness | CWE-707 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 25, 2026 at 22:16 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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