CVE-2026-54234Public exploitNetwork attack vector

Remote service crash via recovered-token boundary error

Published Jul 6, 2026 · Updated Jul 6, 2026

Improper input validation in vLLM before 0.24.0 allows remote attackers to crash a shared engine worker through public gRPC requests. The rejection sampler lets an out-of-range Triton tile win a tie, converts the recovered boundary token to -1, and reinjects it into live drafter input IDs. The optional unauthenticated gRPC interface must be enabled and reachable; exploitation aborts concurrent requests and leaves the service unavailable until restart.

CVSS severity7.5
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in vLLM before 0.24.0 allows remote attackers to crash a shared engine worker through public gRPC requests. The rejection sampler lets an out-of-range Triton tile win a tie, converts the recovered boundary token to -1, and reinjects it into live drafter input IDs. The optional unauthenticated gRPC interface must be enabled and reachable; exploitation aborts concurrent requests and leaves the service unavailable until restart.

The record

CVE
CVE-2026-54234
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
vLLM Project
Product
vLLM
Classifications
CWE-1284, CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

vLLM Project · vLLMversion=< 0.24.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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