CVE-2026-41481 — Server-Side Request Forgery

title: LangChain SSRF via HTMLHeaderTextSplitter URL Fetch - CVE-2026-41481
id: scw-2026-04-24-ai-1
status: experimental
level: high
description: |
  Detects potential exploitation of CVE-2026-41481 by identifying requests to the '/split_text_from_url' endpoint within LangChain applications. This endpoint, when vulnerable, allows an attacker to provide a URL that, after redirects, can point to internal or sensitive endpoints, leading to SSRF. This rule specifically targets the vulnerable function's likely entry point.
author: SCW Feed Engine (AI-generated)
date: 2026-04-24
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-41481/
tags:
  - attack.lateral_movement
  - attack.t1071.001
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/split_text_from_url'
      cs-method:
          - 'POST'
      sc-status:
          - '200'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse