Deserialization of Untrusted Data in vLLM - CVE-2026-115912
Published: November 9, 2026
Vulnerability identifier: #VU162989
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-115912
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated remote attacker to execute arbitrary Python code in a vLLM worker process.
The vulnerability exists due to unvalidated shared-memory handles reaching unsafe deserialization in the multimodal cache when --mm-processor-cache-type shm is enabled. An authenticated remote attacker can stage malicious bytes through public inference requests and submit a forged handle to trigger code execution, even with VLLM_ALLOW_INSECURE_SERIALIZATION=0.
Affected software
vLLM
How to mitigate CVE-2026-115912
Install security update from vendor's website.
vLLM - update to 0.32.0