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vLLM allows clients to crash the openai server with invalid regex

Moderate severity GitHub Reviewed Published May 28, 2025 in vllm-project/vllm • Updated May 30, 2025

Package

pip vllm (pip)

Affected versions

>= 0.8.0, < 0.9.0

Patched versions

0.9.0

Description

Impact

A denial of service bug caused the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg, but for regex instead of a JSON schema.

Issue with more details: vllm-project/vllm#17313

Patches

References

@russellb russellb published to vllm-project/vllm May 28, 2025
Published to the GitHub Advisory Database May 28, 2025
Reviewed May 28, 2025
Published by the National Vulnerability Database May 30, 2025
Last updated May 30, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

CVE ID

CVE-2025-48943

GHSA ID

GHSA-9hcf-v7m4-6m2j

Source code

Credits

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