Affected: InternLM lmdeploy

LMDeploy is a toolkit for compressing, deploying, and serving large language models. Versions prior to 0.12.3 have a Server-Side Request Forgery (SSRF) vulnerability in LMDeploy's vision-language module. The `load_image()` function in `lmdeploy/vl/utils.py` fetches arbitrary URLs without validating internal/private IP addresses, allowing attackers to access cloud metadata services, internal networks, and sensitive resources. Version 0.12.3 patches the issue.

Affected: PyPI: lmdeploy

## Summary

A Server-Side Request Forgery (SSRF) vulnerability exists in LMDeploy's vision-language module. The `load_image()` function in `lmdeploy/vl/utils.py` fetches arbitrary URLs without validating internal/private IP addresses, allowing attackers to access cloud metadata services, internal networks, and sensitive resources.

## Affected Versions

- **Tested on:** main branch (2026-02-04) - **Affected:** All versions prior to 0.12.3

## Vulnerable Code

**File:** `lmdeploy/vl/utils.py` (lines 64-67) ```python def load_image(image_url: Union[str, Image.Image]) -> Image.Image: # ... if image_url.startswith('http'): response = requests.get(image_url, headers=headers, timeout=FETCH_TIMEOUT) # NO VALIDATION OF URL/IP BEFORE REQUEST ```

**Also affected:** `encode_image_base64()` function (lines 26-29)

## Root Cause

1. No validation of URLs before fetching 2. No blocklist for internal IPs (127.0.0.1, 169.254.x.x, 10.x.x.x, 192.168.x.x) 3. Server binds to `0.0.0.0` by default (api_server.py line 1393) 4. API keys disabled by default

## Attack Scenario

1. LMDeploy server deployed with vision-language model 2. Attacker sends request to `/v1/chat/completions` with malicious `image_url`: ```python POST /v1/chat/completions { "model": "internlm-xcomposer2", "messages": [{ "role": "user", "content": [ {"type": "text", "text": "Describe this image"}, {"type": "image_url", "image_url": {"url": "http://169.254.169.254/latest/meta-da…