Denial of Service Vulnerability in vLLM from OpenAI
CVE-2026-116178

8.2HIGH

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
25 October 2026

What is CVE-2026-116178?

A denial of service vulnerability exists in vLLM versions prior to 0.30.0, allowing remote attackers to disrupt service by sending malformed multimodal metadata to the /inference/v1/generate endpoint. By exploiting misconfigured mm_placeholders or sending incompatible kwargs_data and mm_hashes, attackers can trigger a negative text span during engine position construction in Qwen2.5-VL, causing the engine to become unresponsive. This vulnerability necessitates immediate attention to prevent potential service outages.

Affected Version(s)

vllm 0.20.0 < 0.30.0

vllm 0.30.0

References

https://github.com/vllm-project/vllm/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/vllm-0.20.0-before-0...
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

JSGforever
jperezdealgaba
.