Denial of Service Vulnerability in vllm-project vllm by OpenAI
CVE-2026-9540

6.9MEDIUM

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
26 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9540?

A vulnerability exists in vllm 0.19.0 related to the OpenAI-compatible Serving Path, allowing attackers to exploit this issue remotely, leading to denial of service. The potential for manipulation makes it critical for users to address this vulnerability urgently. A pull request is available for a fix, but it is pending acceptance, highlighting the importance of monitoring the situation and applying security updates when available.

Affected Version(s)

vllm 0.19.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-9540 - Proof of Concept

References

https://vuldb.com/vuln/365601
vdb-entry
https://vuldb.com/vuln/365601/cti
signaturepermissions-required
https://vuldb.com/submit/814645
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zyz3366 (VulDB User)
VulDB CNA Team
.