vLLM before 0.29.0 fails to enforce decoder prompt-length validation on the disaggregated serving endpoint /inference/v1/generate. When the request contains a 'features' (multimodal) payload, vllm/entrypoints/serve/disagg/serving.py builds a multimodal EngineInput directly from the caller-supplied token_ids, and GenerateRequest.token_ids (vllm/entrypoints/serve/disagg/protocol.py) is not checked against model_config.max_model_len. For multimodal processors that report skip_prompt_length_check=True (for example Nemotron Parse, Whisper, and FireRedLID), InputProcessor._validate_prompt_len() returns immediately for both encoder and decoder prompts, so an overlong prompt becomes an EngineCoreRequest and reaches the worker input-batch copy into a fixed max_model_len-wide NumPy row. A client able to reach the endpoint on an affected model configuration can therefore submit an overlong token_ids list to trigger a worker failure and denial of service. Fixed in 0.29.0.
References
| Link | Resource |
|---|---|
| https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9 | Exploit Vendor Advisory |
| https://www.vulncheck.com/advisories/vllm-before-0.29.0-denial-of-service-via-decoder-prompt-length-bypass | Third Party Advisory |
| https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9 | Exploit Vendor Advisory |
Configurations
History
06 Oct 2026, 19:30
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Vllm vllm
Vllm |
|
| References | () https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9 - Exploit, Vendor Advisory | |
| References | () https://www.vulncheck.com/advisories/vllm-before-0.29.0-denial-of-service-via-decoder-prompt-length-bypass - Third Party Advisory | |
| CPE | cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* |
28 Sep 2026, 19:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9 - |
26 Sep 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-09-26 14:16
Updated : 2026-10-06 19:30
NVD link : CVE-2026-100651
Mitre link : CVE-2026-100651
CVE.ORG link : CVE-2026-100651
JSON object : View
Products Affected
vllm
- vllm
CWE
CWE-400
Uncontrolled Resource Consumption