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vLLM EUVDEUVD-2026-76873

| CVE-2026-90555 HIGH
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-09-12 VulnCheck GHSA-mpw6-hvj8-87hq
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Network-reachable endpoint, low complexity, authenticated (PR:L); availability-only impact; scope unchanged as crash stays within the vLLM process boundary.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 12, 2026 - 15:20 vuln.today
Patch available
Sep 12, 2026 - 14:01 EUVD
Analysis Generated
Sep 12, 2026 - 13:05 vuln.today
CVE Published
Sep 12, 2026 - 12:08 cve.org
HIGH 7.1

DescriptionCVE.org

vLLM versions before 0.28.0 fail to validate audio sample rate headers in the transcription endpoint, allowing authenticated clients to bypass duration checks. Attackers can submit forged FLAC headers with inflated sample rates to trigger excessive memory allocation and crash the API server process affecting all tenants.

AnalysisAI

Uncontrolled memory allocation in vLLM's transcription endpoint before 0.28.0 allows authenticated API clients to crash the entire server process by submitting FLAC audio files with forged, inflated sample rate headers. Because vLLM commonly operates as a shared API server across multiple tenants, a single authenticated attacker can deny service to all concurrent users. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires valid API credentials sufficient for authenticated access to the vLLM transcription endpoint (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H) is internally consistent with the description: network-reachable, low complexity, requires authentication (PR:L), and produces high availability impact with no confidentiality or integrity loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to vLLM 0.28.0 or later, which introduces validation of audio sample rate headers in the transcription endpoint. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all vLLM deployments used in multi-tenant or shared-service configurations and identify all API users with transcription endpoint access. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-76873 vulnerability details – vuln.today

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