MediumVulnerabilityLLM-specific

CVE-2026-116173: vLLM denial of service through oversized logprob token lists in gRPC frontend

Source: NVD(opens in a new tab)
Identifier: CVE-2026-116173
Published: October 25, 2026
Record updated: October 25, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

vLLM from 0.22.0 before 0.24.0 has a denial of service flaw in its Rust gRPC frontend, tracked as CVE-2026-116173. Remote attackers can bypass logprob_token_ids limits by sending Generate or GenerateStream requests with output_logprobs enabled and more than 128 output_candidates.token_ids, which triggers a fatal sampler exception that terminates EngineCore.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 5.9(medium)
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector: network
Attack complexity: high
Privileges required: none
User interaction: none
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 25, 2026.
Disclosure date: October 25, 2026

Weaknesses and techniques

Weakness (CWE): CWE-20

Classification

Attack type: Denial of service
Attack sophistication: Trivial
AI component targeted: Inference
Impact: Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-116173

First tracked: October 25, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 95% (self-assessed)

Topics

Inference infrastructure

Summary

Mitigation

Topics

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