vLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector unwritten. A client sharing the engine can send prompt_logprobs (or echo with logprobs) against a connector-cached prefix, making tokenizer decode raise OverflowError, which crashes EngineCore and drops all co-tenant requests.
Metrics
Affected Vendors & Products
References
History
Mon, 26 Oct 2026 20:30:00 +0000
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ssvc
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Mon, 26 Oct 2026 00:30:00 +0000
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threat_severity
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threat_severity
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Sun, 25 Oct 2026 20:30:00 +0000
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Vllm-project
Vllm-project vllm |
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Vllm-project
Vllm-project vllm |
Sun, 25 Oct 2026 13:45:00 +0000
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| Description | vLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector unwritten. A client sharing the engine can send prompt_logprobs (or echo with logprobs) against a connector-cached prefix, making tokenizer decode raise OverflowError, which crashes EngineCore and drops all co-tenant requests. | |
| Title | vLLM from 0.8.5 before 0.31.0 Cross-Tenant DoS via Uninitialized LogprobsTensors | |
| First Time appeared |
Vllm
Vllm vllm |
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| Weaknesses | CWE-908 | |
| CPEs | cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Vllm
Vllm vllm |
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cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-25T13:20:19.199Z
Updated: 2026-10-26T19:48:35.789Z
Reserved: 2026-10-25T12:26:13.487Z
Link: CVE-2026-116180
Updated: 2026-10-26T19:46:52.237Z
Status : Analyzed
Published: 2026-10-25T14:16:57.760
Modified: 2026-10-28T15:40:03.157
Link: CVE-2026-116180