CVE-2026-22778
📋 TL;DR
This vulnerability in vLLM allows attackers to leak heap memory addresses by sending invalid images to the multimodal endpoint, which reduces ASLR entropy and can be chained with a heap overflow in JPEG2000 decoders to achieve remote code execution. Systems running vLLM versions 0.8.3 through 0.14.0 with the multimodal endpoint enabled are affected. The vulnerability is particularly dangerous because it can lead to full system compromise.
💻 Affected Systems
- vLLM
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Information disclosure of heap memory addresses enabling more reliable exploitation of other vulnerabilities.
If Mitigated
Limited information disclosure without successful RCE due to additional security controls.
🎯 Exploit Status
Requires chaining with JPEG2000 decoder heap overflow for RCE, but information disclosure is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.14.1
Vendor Advisory: https://github.com/vllm-project/vllm/security/advisories/GHSA-4r2x-xpjr-7cvv
Restart Required: Yes
Instructions:
1. Update vLLM to version 0.14.1 or later using pip: pip install --upgrade vllm>=0.14.1
2. Restart all vLLM services
3. Verify the fix by checking the version
🔧 Temporary Workarounds
Disable Multimodal Endpoint
allDisable the vulnerable multimodal endpoint if not required
Configure vLLM to disable multimodal features in deployment settings
Network Segmentation
allRestrict access to vLLM endpoints to trusted networks only
Use firewall rules to limit access to vLLM ports
🧯 If You Can't Patch
- Implement strict input validation for image uploads
- Deploy WAF rules to block malformed image requests
🔍 How to Verify
Check if Vulnerable:
Check vLLM version and verify if multimodal endpoint is enabledCheck Version:
python -c "import vllm; print(vllm.__version__)"Verify Fix Applied:
Confirm vLLM version is 0.14.1 or later and test with invalid image uploads📡 Detection & Monitoring
Log Indicators:
- PIL error messages in logs
- Invalid image upload attempts
- Heap address disclosures in error responses
Network Indicators:
- HTTP requests with malformed images to multimodal endpoints
- Unusual error response patterns
SIEM Query:
source="vllm" AND ("PIL" OR "heap" OR "address") AND error