CVE-2025-46560 (GCVE-0-2025-46560)
Vulnerability from cvelistv5 – Published: 2025-04-30 00:24 – Updated: 2025-04-30 13:09
VLAI
EPSS
VEX
Title
vLLM phi4mm: Quadratic Time Complexity in Input Token Processing leads to denial of service
Summary
vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs. Versions starting from 0.8.0 and prior to 0.8.5 are affected by a critical performance vulnerability in the input preprocessing logic of the multimodal tokenizer. The code dynamically replaces placeholder tokens (e.g., <|audio_|>, <|image_|>) with repeated tokens based on precomputed lengths. Due to inefficient list concatenation operations, the algorithm exhibits quadratic time complexity (O(n²)), allowing malicious actors to trigger resource exhaustion via specially crafted inputs. This issue has been patched in version 0.8.5.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-30 13:09 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/vllm-project/vllm/security/adv… | x_refsource_CONFIRM |
| https://github.com/vllm-project/vllm/blob/8cac35b… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| vllm-project | vllm |
Affected:
>= 0.8.0, < 0.8.5
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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