vLLM: Loose `cache_salt` validation lets a single request kill EngineCore on LMCache-MP deployments — uncaught downstream `ValueError` denial of service

[ Description ]Official description

vLLM is an inference and serving engine for large language models. Prior to 0.30.0, OpenAI-compatible request models accept a non-empty cache_salt value without enforcing the character and length restrictions required by the IPCCacheServerKey consumer in LMCache-MP. On deployments using the LMCache-MP connector, a salt that contains a forbidden character or exceeds the permitted length can raise an uncaught ValueError during scheduler cache lookup, causing EngineCore to terminate and denying service to all concurrent users. This issue is fixed in version 0.30.0.

[ Fixes ]Fixes and patches

• vllm 0.30.0Fixed version · GitHub Advisories · pip package vllm: upgrade to 0.30.0 or later (affected < 0.30.0)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3754

  vllm: Multiple vulnerabilities allow denial of service Translated from German

  CVE-2026-105758CVE-2026-105760CVE-2026-105759+2 more CVEs

[ Packages ]Affected open-source packages

• vllm pipAffected < 0.30.0 · fixed in 0.30.0 · GHSA-2823-qmq8-rwvj

[ References ]References

• github.com/vllm-project/vllm/commit/e962733e08d10f7ca65dac4df99e116460b8b174Patch
• github.com/vllm-project/vllm/pull/51444Issue TrackingPatch
• github.com/vllm-project/vllm/releases/tag/v0.30.0Release Notes
• github.com/vllm-project/vllm/security/advisories/GHSA-2823-qmq8-rwvjMitigationVendor Advisory