CVE-2026-9540 Details
Description
A vulnerability was identified in vllm-project vllm 0.19.0. This issue affects some unknown processing of the component OpenAI-compatible Serving Path. Such manipulation leads to denial of service. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.
A denial-of-service vulnerability has been identified in vllm-project vllm version 0.19.0. The issue arises from an unknown processing flaw in the OpenAI-compatible Serving Path component, which can be exploited remotely. The vulnerability causes a significant increase in response times for co-scheduled requests, with some experiencing up to a 423-fold delay. This issue was discovered during fuzz testing and has a public exploit available. A pull request to address the vulnerability is pending acceptance.
Users can update to vllm version 0.19.1, where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 26, 2026CISA-ADP
Assessed May 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vllm-project/vllm/ | [email protected] | Vendor |
| https://github.com/vllm-project/vllm/issues/37343 | [email protected] | Issue TrackingTechnical DescriptionVendor |
| https://github.com/vllm-project/vllm/pull/37594 | [email protected] | Issue TrackingVendor |
| https://ingero.io/debugging-vllm-latency-minimax-ollama-mcp/ | [email protected] | Technical Analysis |
| https://vuldb.com/submit/814645 | [email protected] | Permission Required |
| https://vuldb.com/vuln/365601 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/365601/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vllm-project vllm | 0.19.0 (semver) |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | New CVE Received | [email protected] |