What’s Vulnerable › Vulnerabilities

CVE-2026-105753: vLLM: Mirrored multimodal IPC caches desync after a rejected request — a later request reusing the same media hash trips a receiver assertion in the engine core

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-05 · updated 2026-10-08
• Weakness: CWE-617

Description

vLLM is an inference and serving engine for large language models. Prior to 0.28.0, the default mirrored multimodal LRU cache can commit a media hash in the frontend sender cache during multimodal rendering and before engine admission, while the engine receiver cache never receives the payload if that request is rejected. A later request reusing the same media hash causes MultiModalProcessorSenderCache to send no payload and MultiModalReceiverCache to reach an assertion with the message "Expected a cached item," producing a shared-service availability failure. This issue is fixed in version 0.28.0.

Affected products

• vllm-project vllm: before 0.28.0 — fixed in 0.28.0

How to fix

Upgrade to a fixed version: vllm-project vllm 0.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/vllm-project/vllm/commit/396204230423b7cc6798300926b8fa30190d26a9
• https://github.com/vllm-project/vllm/pull/46747
• https://github.com/vllm-project/vllm/pull/51897
• https://github.com/vllm-project/vllm/releases/tag/v0.28.0
• https://github.com/vllm-project/vllm/security/advisories/GHSA-ph3r-5jfg-f84f

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