CVE-2025-48943

Name: CVE-2025-48943
Creator: NVD / NIST
Published: 2025-05-30T19:15:30.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2025-48943 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.40%

31.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-248

Affected Software

Vendor	Product	Versions
Vllm	Vllm	>= 0.8.0, < 0.9.0

References

https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ffPatch
https://github.com/vllm-project/vllm/issues/17313Issue Tracking
https://github.com/vllm-project/vllm/pull/17623Issue Tracking, Patch
https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2jVendor Advisory

Timeline

Published: May 30, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-48943?

How severe is CVE-2025-48943?

CVE-2025-48943 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2025-48943?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-48943?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST