Bug 2561042 (CVE-2026-115912)

Summary: CVE-2026-115912 vllm: vllm: Arbitrary code execution via forged shared-memory handles
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, mwoodson, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM. In scale-out deployments utilizing shared-memory multimodal caching, worker nodes fail to validate shared-memory references provided in incoming requests. An authenticated remote attacker can exploit this vulnerability by submitting forged memory references pointing to attacker-controlled data. When the worker process deserializes this untrusted data, it leads to arbitrary code execution.
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Description OSIDB Bzimport 2026-10-26 19:51:42 UTC 
vLLM is an inference and serving engine for large language models. Prior to 0.32.0, an authenticated caller can place forged shared-memory address and monotonic_id values in public multimodal features.kwargs_data. In scale-out deployments with shared-memory multimodal caching enabled, workers trust those values and pass attacker-selected bytes to pickle.loads(), allowing arbitrary Python execution even when insecure serialization is disabled. This issue is fixed in version 0.32.0.