Vulnerability in vllm-project vllm

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3828

  vllm: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-116176CVE-2026-116180CVE-2026-116177+4 more CVEs

[ References ]References

• github.com/vllm-project/vllm/security/advisories/GHSA-rhcx-5729-88vgMitigationVendor Advisory
• www.vulncheck.com/advisories/vllm-from-0.8.5-before-0.31.0-cross-tenant-dos-via-uniniti…Third Party Advisory