Input validation error in vLLM - CVE-2026-105756
Published: November 9, 2026
Vulnerability identifier: #VU162992
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105756
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged remote attacker to cause a denial of service for all concurrent users of a vLLM server.
The vulnerability exists due to insufficient validation of cache_salt in vLLM request models when the optional LMCache-MP KV connector is enabled. A low-privileged remote attacker can submit a single request containing a salt rejected by LMCache, triggering an uncaught validation exception that terminates the EngineCore process.
Affected software
vLLM
How to mitigate CVE-2026-105756
Install security update from vendor's website.
vLLM - update to 0.30.0