Resource exhaustion in Vllm
CVE-2025-62426
vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before 0.11.1, the /v1/chat/completions and /tokenize endpoints allow a chat_template_kwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chat_template_kwargs parameters, it is possible to block processing of the API server for long periods of time, delaying all other requests. This issue has been patched in version 0.11.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Vllm — versions 0.11.1
- Vllm-Project Vllm — versions >= 0.5.5, < 0.11.1
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/security/advisories/GHSA-69j4-grxj-j64p (Vendor Advisory)
- github.com/vllm-project/vllm/pull/27205 (Issue Tracking)
- github.com/vllm-project/vllm/commit/3ada34f9cb4d1af763fdfa3b481862a93eb6bd2b (Patch)
- github.com/vllm-project/vllm/blob/2a6dc67eb520ddb9c4138d8b35ed6fe6226997fb/vllm… (Product)
- github.com/vllm-project/vllm/blob/2a6dc67eb520ddb9c4138d8b35ed6fe6226997fb/vllm… (Product)
Frequently asked questions
- What is CVE-2025-62426?
- CVE-2025-62426 is a medium-severity vulnerability in Vllm, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2025-11-21.
- How severe is CVE-2025-62426?
- Medium severity. CVSS v3 base score is 6.5 out of 10.