Vulnerability in Vllm
CVE-2026-90555
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/security/advisories/GHSA-99f2-hwrc-gvq8 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/vllm-before-0.28.0-denial-of-service-via-audio-hea… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-90555?
- CVE-2026-90555 is a medium-severity vulnerability in Vllm, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 6.5/10. Published 2026-09-12.
- How severe is CVE-2026-90555?
- Medium severity. CVSS v3 base score is 6.5 out of 10.