Denial of Service Vulnerability in vLLM by vLLM Project
CVE-2026-116180

8.3HIGH

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
25 October 2026

What is CVE-2026-116180?

The vLLM application from versions 0.8.5 to 0.30.0 is susceptible to a Denial of Service (DoS) issue due to an uninitialized int32 tensor allocation in the LogprobsTensors.empty_cpu() function. When a client interacts with the engine and sends prompt_logprobs against a connector-cached prefix, the tokenizer decode operation may trigger an OverflowError. This error leads to the crashing of EngineCore, resulting in a complete drop of all requests from co-tenants. Users and organizations using the affected versions are advised to update to mitigate this vulnerability.

Affected Version(s)

vllm 0.8.5 < 0.31.0

vllm 0.31.0

References

https://github.com/vllm-project/vllm/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/vllm-from-0.8.5-befo...
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

mcgrof
jperezdealgaba
.