vLLM DOS: Remotely kill vllm over http with invalid JSON schema
Priority MEDIUM 62CWE-248Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-248.
Summary
vLLM is an inference and serving engine for large language models (LLMs). In versions 0.8.0 up to but excluding 0.9.0, hitting the /v1/completions API with a invalid json_schema as a Guided Param kills the vllm server. This vulnerability is similar GHSA-9hcf-v7m4-6m2j/CVE-2025-48943, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00575 47th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial vllm (vllm-project): 0.9.0vllm (PyPI): 0.9.0Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| vllm-project | vllm | 0.8.0 to before 0.9.0 | 0.9.0 | Patch available | CNA |
| — | vllm (PyPI) | 0.8.0 to before 0.9.0 | 0.9.0 | Patch available | GHSA-6qc9-v4r8-22xg |
- vllm Vendorvllm-project Affected 0.8.0 to before 0.9.0 Fixed in 0.9.0 Patch available CNA
- vllm (PyPI) Vendor— Affected 0.8.0 to before 0.9.0 Fixed in 0.9.0 Patch available GHSA-6qc9-v4r8-22xg
Remediation
- Fix · CNA vllm (vllm-project) Fixed in 0.9.0
- Fix · GHSA-6qc9-v4r8-22xg vllm (PyPI) Fixed in 0.9.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat AI Inference Server | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AI (RHEL AI) | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-48942
- 2026-10-03 Alias added: GHSA-6qc9-v4r8-22xg
References
Patch 2
More vllm-project vulnerabilities
- TI-2024-10229 Remote Code Execution in vllm-project/vllm CVSS 3.0CRITICAL 9.8
- TI-2024-08404 Remote Code Execution in vllm-project/vllm CVSS 3.1CRITICAL 9.8
- TI-2026-36017 vLLM: OpenAI auth bypass CVSS 3.1CRITICAL 9.1
- TI-2026-63056 vLLM before 0.28.0 Denial of Service via negative token ID CVSS 4.0HIGH 8.7
- TI-2026-04308 Hardcoded trust_remote_code=True in vllm-project/vllm Bypasses User Security Control CVSS 3.0HIGH 8.8
- TI-2026-39137 vLLM: Remote DoS in vLLM via Invalid Recovered Token Reinjection CVSS 3.1HIGH 7.5
Sources
- CVE-2025-48942 · CVE Program
- CVE-2025-48942 · NVD
- FIRST EPSS
- GHSA-6qc9-v4r8-22xg · GitHub Advisory Database · CC BY 4.0
- CVE-2025-48942 · Red Hat security data · CC BY 4.0
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