vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to terminate EngineCore by bypassing logprob_token_ids limits in the Rust gRPC frontend. Attackers can send Generate or GenerateStream requests with output_logprobs enabled and more than 128 output_candidates.token_ids, triggering a fatal sampler exception that crashes the engine.

Metrics

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Vllm
  • Vllm
Vllm-project
  • Vllm

Configuration 1 [-]

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://github.com/vllm-project/vllm/security/advisories/GHSA-6pgw-f3pv-4h8q cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-116173 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-116173 cve-icon
https://www.vulncheck.com/advisories/vllm-0.22.0-before-0.24.0-denial-of-service-via-grpc-output-candidates-token-ids cve-icon cve-icon cve-icon
History

Mon, 26 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 26 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-248
References
Metrics threat_severity

None

 threat_severity

Moderate

Sun, 25 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Vllm-project
Vllm-project vllm
Vendors & Products Vllm-project
Vllm-project vllm

Sun, 25 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Description vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to terminate EngineCore by bypassing logprob_token_ids limits in the Rust gRPC frontend. Attackers can send Generate or GenerateStream requests with output_logprobs enabled and more than 128 output_candidates.token_ids, triggering a fatal sampler exception that crashes the engine.
Title vLLM 0.22.0 before 0.24.0 Denial of Service via gRPC output_candidates.token_ids
First Time appeared Vllm
Vllm vllm
Weaknesses CWE-20
CPEs cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*
Vendors & Products Vllm
Vllm vllm
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-25T13:20:14.431Z

Updated: 2026-10-26T19:48:36.065Z

Reserved: 2026-10-25T12:25:26.984Z

Link: CVE-2026-116173

cve-icon Vulnrichment

Updated: 2026-10-26T19:47:27.829Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-25T14:16:56.720

Modified: 2026-10-28T15:43:02.270

Link: CVE-2026-116173

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-25T13:20:14Z

Links: CVE-2026-116173 - Bugzilla