Vulnerability · Published May 26, 2026 · Assigned by VulDB
CVE-2026-9540vllm-project vllm OpenAI-compatible Serving Path denial of service
Medium 5.3
In plain English
A medium-severity security flaw in vllm from vllm-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 62.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | vllm | no fix listed | GHSA-98f3-hwg4-4rf7 |
| PyPI | vllm | no fix listed | PYSEC-2026-3407 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vllm-project | vllm | 0.19.0 |
Weakness: CWE-404 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
References
- VDB-365601 | vllm-project vllm OpenAI-compatible Serving Path denial of service vdb-entry
- VDB-365601 | CTI Indicators (IOB, IOC, TTP) signature, permissions-required
- Submit #814645 | vllm-project vllm 0.19.0 Denial of Service third-party-advisory
- https://github.com/vllm-project/vllm/issues/37343 exploit, issue-tracking
- https://github.com/vllm-project/vllm/pull/37594 issue-tracking, patch
- https://ingero.io/debugging-vllm-latency-minimax-ollama-mcp/ related
- https://github.com/vllm-project/vllm/ product