Service interruption via quadratic placeholder expansion
Published Apr 30, 2025 · Updated Apr 30, 2025
Resource exhaustion in vLLM 0.8.0 through 0.8.4 allows remote authenticated users to interrupt inference service via crafted multimodal input. The input_processor_for_phi4mm function repeatedly concatenates placeholder-token expansions into a growing list, producing quadratic preprocessing work. Access to an inference endpoint that accepts Phi-4 multimodal requests is required, and the reported consequence is service resource exhaustion rather than data access or modification.
Summary
What happened
Resource exhaustion in vLLM 0.8.0 through 0.8.4 allows remote authenticated users to interrupt inference service via crafted multimodal input. The input_processor_for_phi4mm function repeatedly concatenates placeholder-token expansions into a growing list, producing quadratic preprocessing work. Access to an inference endpoint that accepts Phi-4 multimodal requests is required, and the reported consequence is service resource exhaustion rather than data access or modification.
The record
- CVE
- CVE-2025-46560
- Published
- Apr 30, 2025
- Updated
- Apr 30, 2025
- Vendor
- vLLM Project
- Product
- vLLM
- Classifications
- CWE-1333, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 30, 2025CVE publishedPublication date reported by the CVE source.
- Apr 30, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 0.8.0, < 0.8.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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