Denial of Service Vulnerability in vLLM by vLLM Project
CVE-2026-116173

8.2HIGH

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
25 October 2026

What is CVE-2026-116173?

vLLM versions prior to 0.24.0 are susceptible to a denial of service vulnerability that can be exploited by remote attackers. By sending Generate or GenerateStream requests with the output_logprobs enabled and exceeding the limit of 128 output_candidates.token_ids, attackers can provoke a fatal sampler exception. This results in the unexpected crashing of the EngineCore, rendering the service unavailable.

Affected Version(s)

vllm 0.22.0 < 0.24.0

vllm 0.24.0

References

https://github.com/vllm-project/vllm/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/vllm-0.22.0-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

rexpository
jperezdealgaba
.