Medium severity · published Sep 12, 2026
CVE-2026-90555
vLLM before 0.28.0 Denial of Service via Audio Header
6.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VL
vLLM · vllm-project
before 0.28.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90555
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90555
Vendor Advisory
https://github.com/vllm-project/vllm/security/advisories/GHSA-99f2-hwrc-gvq8
Third Party Advisory
https://www.vulncheck.com/advisories/vllm-before-0.28.0-denial-of-service-via-audio-header
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