Vulnerability in Vllm
CVE-2025-48943
vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.
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: 0.005 (38.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Vllm
- Vllm-Project Vllm — versions >= 0.8.0, < 0.9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j (Vendor Advisory)
- github.com/vllm-project/vllm/issues/17313 (Issue Tracking)
- github.com/vllm-project/vllm/pull/17623 (Patch, Issue Tracking)
- github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff (Patch)
Frequently asked questions
- What is CVE-2025-48943?
- CVE-2025-48943 is a medium-severity vulnerability in Vllm, classified under CWE-248. CVSS score: 6.5/10. Published 2025-05-30.
- How severe is CVE-2025-48943?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-48943 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.