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Vulnerability record · CVE-2026-105756 · published 5 October 2026

CVE-2026-105756: Improper input validation vulnerability

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.

6.5 CVSS 3.1 Medium CWE-20 · Improper input validationCWE-248 · CWE-248 Received
6.5CVSS 3.1 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
5 Oct 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://github.com/vllm-project/vllm/commit/e962733e08d10f7ca65dac4df99e116460b8b174
https://github.com/vllm-project/vllm/pull/51444
https://github.com/vllm-project/vllm/releases/tag/v0.30.0
https://github.com/vllm-project/vllm/security/advisories/GHSA-2823-qmq8-rwvj

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Source: NIST National Vulnerability Database (record CVE-2026-105756), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.