MediumVulnerabilityLLM-specific

CVE-2026-116172: vLLM improper input validation bypasses max_logprobs limits

Source: NVD(opens in a new tab)
Identifier: CVE-2026-116172
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 versions from 0.22.0 before 0.24.0 contain an improper input validation flaw in the Rust gRPC converter. Remote attackers can bypass max_logprobs limits through CandidateTokens.top_n, sending Generate or GenerateStream requests with oversized or integer-wrapping top_n values that cause torch.topk to fail and terminate EngineCore.

Mitigation

Fixed in 0.24.0 (upgrade from versions before 0.24.0).

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-2026-116172

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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