Resource Consumption Vulnerability in vLLM by vllm-project
CVE-2026-90878

5.3MEDIUM

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90878?

A resource consumption vulnerability exists in vLLM by vllm-project, specifically affecting the Jinja Template Rendering component within the chat/completions endpoint. Attackers can exploit this vulnerability remotely by manipulating the chat_template argument, leading to significant resource depletion. The vulnerability has been disclosed publicly, and a pull request for a fix is currently pending acceptance. Organizations using vLLM versions up to 0.27.1 are strongly advised to monitor their systems and apply security patches once available.

Affected Version(s)

vLLM 0.27.0

vLLM 0.27.1

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-2026-90878 - Proof of Concept

References

https://vuldb.com/vuln/403472
vdb-entrytechnical-description
https://vuldb.com/vuln/403472/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90878
third-party-advisory

CVSS V4

Score:
5.3
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
.