Vulnerability · Published Sep 12, 2026 · Assigned by VulnCheck
CVE-2026-90555vLLM before 0.28.0 Denial of Service via Audio Header
Medium 6.5
In plain English
A medium-severity security flaw in vLLM from vllm-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 55.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vllm-project | vLLM | 0 – before 0.28.0 |
Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-99f2-hwrc-gvq8) vendor-advisory
- VulnCheck Advisory: vLLM before 0.28.0 Denial of Service via Audio Header third-party-advisory