Uncaught Exception in vLLM - CVE-2026-105757
Published: October 6, 2026
Vulnerability identifier: #VU153334
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-2026-105757
CWE-ID: CWE-248
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper handling of exceptional conditions in the StructuredOutputManager when compiling a duplicate-root EBNF grammar through a latched structured-output backend. A remote user can send structured-output requests that cause an unhandled grammar compilation exception to terminate the shared EngineCore and cause a denial of service.
Exploitation requires two structured-output requests and affects the default automatic backend selection.
Affected software
vLLM
How to mitigate CVE-2026-105757
Install security update from vendor's website.
vLLM - update to 0.30.0