Severity by source
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
Network-reachable endpoint, low complexity, authenticated (PR:L); availability-only impact; scope unchanged as crash stays within the vLLM process boundary.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.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
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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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-76873
GHSA-mpw6-hvj8-87hq