CVE-2026-6985 — The Function Handle_opt Of The File /Src/Net_builtin.C Of Th Vulnerability

title: CVE-2026-6985 - Mongoose TCP Option Handler Infinite Loop
id: scw-2026-04-25-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-6985 by targeting the handle_opt function in Mongoose. The exploit involves manipulating the 'optlen' parameter in a GET request to trigger an infinite loop. This rule looks for specific URI paths and query parameters indicative of this exploit attempt, resulting in a server error (HTTP 500).
author: SCW Feed Engine (AI-generated)
date: 2026-04-25
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-6985/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/src/net_builtin.c'
      cs-uri-query|contains:
          - 'optlen='
      cs-method|exact:
          - 'GET'
      sc-status|exact:
          - '500'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse