CVE-2025-48942

Public Exploit
vLLM DOS: Remotely kill vllm over http with invalid JSON schema

Description

vLLM is an inference and serving engine for large language models (LLMs). In versions 0.8.0 up to but excluding 0.9.0, hitting the /v1/completions API with a invalid json_schema as a Guided Param kills the vllm server. This vulnerability is similar GHSA-9hcf-v7m4-6m2j/CVE-2025-48943, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory github.com
Affected: vllm-project vllm
Published at:
Updated at:

References

Link Tags
https://github.com/vllm-project/vllm/security/advisories/GHSA-6qc9-v4r8-22xg vendor advisory exploit
https://github.com/vllm-project/vllm/issues/17248 issue tracking
https://github.com/vllm-project/vllm/pull/17623 issue tracking patch
https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff patch

Frequently Asked Questions

What is the severity of CVE-2025-48942?
CVE-2025-48942 has been scored as a medium severity vulnerability.
How to fix CVE-2025-48942?
To fix CVE-2025-48942, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-48942 being actively exploited in the wild?
It is possible that CVE-2025-48942 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-48942?
CVE-2025-48942 affects vllm-project vllm.
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