CVE-2026-43620 — Recv_files() In Receiver.C That Vulnerability

title: CVE-2026-43620 Rsync Client Crash via Crafted File List
id: scw-2026-05-20-ai-1
status: experimental
level: high
description: |
  Detects the rsync client process potentially being targeted by CVE-2026-43620. The vulnerability occurs on the receiver side when a malicious rsync server sends a specially crafted file list. This rule looks for rsync.exe processes running in server mode, which would be the target of such an attack. A more specific detection would require network traffic analysis to inspect the rsync protocol flags and file list content, which is beyond the scope of process creation logs.
author: SCW Feed Engine (AI-generated)
date: 2026-05-20
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-43620/
tags:
  - attack.execution
  - attack.t1204.001
logsource:
    category: process_creation
detection:
  selection:
      Image|endswith:
          - 'rsync.exe'
      CommandLine|contains:
          - '--server'
      condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse