CVE-2026-90555Network attack vectorHinoki check available

API server crash via forged FLAC sample rate

Published Sep 12, 2026 · Updated Sep 12, 2026

Denial of service in vLLM before 0.28.0 allows remote authenticated users to crash the API server via a forged FLAC header. The soundfile path calculates duration by dividing frame count by the untrusted header sample rate, then reads decoded float32 PCM into memory. Exploitation requires a transcription-capable model, audio dependencies, and a valid API key; one request can exhaust process memory and interrupt service for all tenants.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in vLLM before 0.28.0 allows remote authenticated users to crash the API server via a forged FLAC header. The soundfile path calculates duration by dividing frame count by the untrusted header sample rate, then reads decoded float32 PCM into memory. Exploitation requires a transcription-capable model, audio dependencies, and a valid API key; one request can exhaust process memory and interrupt service for all tenants.

The record

CVE
CVE-2026-90555
Published
Sep 12, 2026
Updated
Sep 12, 2026
Vendor
vLLM Project
Product
vLLM
Classifications
CWE-1284, CWE-807, CWE-409, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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 <0.28.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

vLLM Project · vLLMversion=0 <0.28.0

Published CVSS scores

6.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CWE-807Reliance on Untrusted Inputs in a Security Decision
CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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