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CVE-2026-116180

vLLM from 0.8.5 before 0.31.0 Cross-Tenant DoS via Uninitialized LogprobsTensors

Severity
High 8.3
Published
25 Oct 2026
Last changed
28 Oct 2026
Added to UpHeron
3 Nov 2026
Fixed in
0.31.0
Sources
NVD, CVE Program

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…

Affected software

SoftwareAffected versions
vLLMServers and applications · cna:vllm-project|vllm
  • From 0.8.5 before 0.31.0
vLLMServers and applications · cpe:a:vllm:vllm
  • From 0.8.5 before 0.31.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-116180
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-116180